Ray is an airline inspector and completed an average of u = 10 inspections each day. The distribution of daily inspections is approximately normal with a standard deviation of o 2 inspections. For a randomly selected day, what is the probability that Ray completes less than 9 inspections? a) 0.3413 O b) 0.1587 c) 0.3085 d) 0.6915

Scores of each of the Knitting Aptitude tests were normally distributed with a mean of 6 hours and a standard deviation of 1.67 hours. Carrie will be taking the test tomorrow. Assume the data is normally distributed. Determine the probability of someone finishing in less than 2.17 hours 0.9891 0.5000 1.0 0.0109

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 NJ Department of Health has reported the average life span of NJ residents is 81 years. If the standard deviation is σ = 4 years, what is the probability of a person living to at least 92 years of age?

The height of all 3-year-old females is approximately normal with a mean of 38.72 inches and a standard deviation of 3.17 inches. What is the probability that in a sample of ten 3-year-old females, the mean height is greater than 40 inches?   A) 0.3432 B) 0.8992 C) 0.2422 D) 0.5066 E) 0.1008

According to AAA, the price of a gallon of regular, unleaded gas across gas stations in Ohio is normally distributed with a mean of $2.39 and a standard deviation of $0.15. If you randomly pick a gas station, what is the probability the price is exactly $2.46 per gallon? A) 0.14 B) 0 C) 1 D) 0.68

Motovolla is producing batteries for cell phones. A study revealed that while using a cell phone constantly the new batteries lasted an average of 250 minutes with a standard deviation of 10 minutes. The data also appeared to be normally distributed. What percent of the batteries lasted less than 4 hours (240 minutes)? 信 54.15 34 1N 13.6% 136N O a) 84.1% O b) 97.7% O ) 15.9% O d) 47.7%