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MATH SOLVE
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General
Carlon plans to evaporate a number of gallons of water from 90 gallons of a 15% salt solution to make a 25% salt solution. Which equation can he use to find x, the number of gallons that should be evaporated? Original (Gallons) Removed (Gallons) New (Gallons) Amount of Salt 13.5 0 Amount of Solution 90 x
General
4 months ago
Use the normal distribution of SAT critical reading scores for which the mean is 513 and the standard deviation is 110. Assume the variable x is normally distributed. (a )What percent of the SAT verbal scores are less than 650? (b )If 1000 SAT verbal scores are randomly selected, about how many would you expect to be greater than 575? (a )Approximately nothing% of the SAT verbal scores are less than 650.
General
4 months ago
The area of a triangle is 10 square inches and its height is 5 inches. Find the base.2 in.04 in.25 in.
General
4 months ago
The weights of bags of ready-to-eat salad are normally distributed with a mean of 300 grams and a standard deviation of 9 grams. What percent of the bags weigh less than 282 grams? 2.5% 5% 13.5% 34%
General
4 months ago
You will take either a basket-weaving course or a philosophy course, depending on what your advisor decides. You estimate that the probability of getting an A in basket weaving is 0.90, while in philosophy it is 0.60. However, the chances of your advisor choosing the basket-weaving course is only 20%, while there is an 80% chance that he will put you in the philosophy course. What is the probability that you end up with an A? (Enter your answer to three decimal places.)
General
4 months ago
From a population of size 400, a random sample of 40 items is selected. The median of the sample Group of answer choices must be 200, since 400 divided by 2 is 200 must be 10, since 400 divided by 400 is 10 must be equal to the median of population, if the sample is truly random None of these alternatives is correct.
General
4 months ago
Pittsburgh, Pennsylvania, and Buffalo, New York, lie approximately on the same meridian. Pittsburgh has a latitude of 40.5° N, and Buffalo has a latitude of 42.9° N. Find the distance between these two cities. (The radius of the earth is 3960 mi. Round your answer to the nearest mile.)
General
4 months ago
An electronic device factory is studying the length of life of the electronic components they produce. The manager takes a random sample of 50 electronic components from the assembly line and records the length of life in the life test. From the sample he found the average length of life was 100,000 hours and that the standard deviation was 3,000 hours. He wants to find the confidence interval for the average length of life of the electronic components they produced. Based on the information, what advice would you give to him?Select one or more:a. The distribution of the length of life of the electronic components is usually right skewed. Thus, he should not compute the confidence interval.b. He did not take a simple random sample of the electronic components; thus he should not compute the confidence intervalc. The mean and standard deviation are large enough to compute the confidence interval.d. The population is right skewed, but the sample size is large enough to use a normal approximation. Thus he can compute the confidence interval.e. He can calculate the confidence interval but should use a t-distribution since it deals with an average.
General
4 months ago
What is the slope of the line that passes through the points (-4,0) and (-4, -10)?Write your answer in simplest form.
General
4 months ago
Use the diagram to complete the statement.38Given AJKL, sin(38°) equalsO cos(38°).O cos(52°).O tan(38°).O tan(52°).
General
4 months ago
Parameters are a. numerical characteristics of a population b. the averages taken from a sample c. numerical characteristics of a sample d. numerical characteristics of either a sample or a population
General
4 months ago
Pump A can fill a tank of water in 5 hours. Pump B can fill the same tank in 8 hours. How long does it take the two pumps working together to fill the tank?(round your answer to the nearest minute).
General
4 months ago
Bill has a set of 6 black cards and a set of 6 red cards. Each card has a number from 1 through 6, such that each of the numbers 1 through 6 appears on 1 black card and 1 red card. Bill likes to play a game in which he shuffles all 12 cards, turns over 4 cards, and looks for pairs of cards that have the same value. What is the chance that Bill finds at least one pair of cards that have the same value?
General
4 months ago
A partial proof was constructed given that MNOP is a parallelogram. Parallelogram M N O P is shown. By the definition of a parallelogram, MN ∥ PO and MP ∥ NO. Using MP as a transversal, ∠M and ∠P are same-side interior angles, so they are supplementary. Using NO as a transversal, ∠N and ∠O are same-side interior angles, so they are supplementary. Using OP as a transversal, ∠O and ∠P are same-side interior angles, so they are supplementary. Therefore, __________________ because they are supplements of the same angle. Which statement should fill in the blank in the last line of the proof? ∠M is supplementary to ∠O ∠N is supplementary to ∠P ∠M ≅ ∠P ∠N ≅ ∠P
General
4 months ago
Consider the relationship between the number of bids an item on eBay received and the item's selling price. The following is a sample of 5 items sold through an auction.Price in dollars 23 29 32 38 41Number of Birds 10 14 15 16 17A) Step 1 of 3: Draw a scatter plot of the given data.B)Step 2 of 3: Estimate the correlation in words: positive, negative, no correlation.C) Step 3 of 3: Calculate the correlation coefficient, r. Round your answer to three decimal places
General
4 months ago
Which of the following is not true about the Student's t distribution? a. It has more area in the tails and less in the center than does the normal distribution. b. It is used to construct confidence intervals for the population mean when the population standard deviation is known. c. It is bell shaped and symmetrical. d. As the number of degrees of freedom increases, the t distribution approaches the normal distribution. e. both (a) and (b)
General
4 months ago
14. Solve: 3x² + 5x – 12 = 0B. 4-3C. 8, - 18
General
4 months ago
A man starts walking north at 4 ft/s from a point P. Five minutes later a woman starts walking south at 5 ft/s from a point 500 ft due east of P. At what rate are the people moving apart 15 minutes after the woman starts walking
General
4 months ago
The probability of drawing two aces from a standard deck is 0.0059. We know this probability, but we don't know if the first card was replaced. If the two draws are defined as event A and event B, are the events dependent or independent? A. They are dependent because, based on the probability, the first ace was replaced before drawing the second ace. B. They are dependent because, based on the probability, the first ace was not replaced before drawing the second ace. C. They are independent because, based on the probability, the first ace was replaced before drawing the second ace. D. They are independent because, based on the probability, the first ace was not replaced before drawing the second ace.
General
4 months ago
Suppose the time to process a loan application follows a uniform distribution over the range of 8 to 13 days. What is the probability that a randomly selected loan application takes longer than 12 days to process?
General
4 months ago
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