The length of time it takes a college student to find a parking spot in the library parking lot follows a normal distribution with a mean of 7.0 minutes and a standard deviation of 1 minute. Find the probability that a randomly selected college student will find a parking spot in the library parking lot is less than 6.5 minutes. OA. 3551 O B. 1915 OC. .3085 OD. 2674

The length of the long-distance calls made by the employees of a certain company are normally distributed with a mean of 6.3 minutes and a standard deviation of 2.5 minutes. Find the probability that a call will last between 5 and 10 minutes. A. .3897     B. .1788.   C. .6290.    D. .6308

The Wechsler Adult Intelligence Scale is a common "IQ test" for adults. Scores for people over age 16 are Normally distributed with a mean of 100 and a standard deviation of 15. Suppose one adult was administered the test. Find the probability his or her score was above 108. O 0.8238 O 0.7031 O 0.2969 O 0.1762

A subway train arrives every eight minutes during rush hour. We are interested in the length of time a commuter must wait for a train to arrive. The time follows a uniform distribution. a. Find the mean, μ = b. Find the standard deviation, σ =              Round to the nearest tenth.

The average income tax refund for the 2009 tax year was $3142. Assume the refund per person follows the normal probability distribution with a standard deviation of $926. Complete parts a through d below. a. What is the probability that a randomly selected tax return refund will be more than $2100? (Round to four decimal places as needed.) b. What is the probability that a randomly selected tax return refund will be between $1400 and $3000? (Round to four decimal places as needed.) c. What is the probability that a randomly selected tax return refund will be between $3200 and $4200? (Round to four decimal places as needed.) d. What refund amount represents the 35th percentile of tax returns? $ (Round to the nearest dollar as needed.)

The lengths of pregnancies are normally distributed with a mean of 268days and a standard deviation of 15 days. a. Find the probability of a pregnancy lasting 309 days or longer. b. If the length of pregnancy is in the lowest 2​%, then the baby is premature. Find the length that separates premature babies from those who are not premature.   a. The probability that a pregnancy will last 309 days or longer is   ​(Round to four decimal places as​ needed.)   b. Babies who are born on or before____days are considered premature. ​   (Round to the nearest integer as​ needed.)

The mean weight of 1000 students at a certain high school is 140 pounds and the standard deviation of 10 pounds. Assuming that the weights are normally distributed. How many students weigh more than 150 pounds? Select one: O 342.3 O 343.3 O 341.3 O 344.3