Ages of Proofreaders At a large publishing company, the mean age of proofreaders is 36.2 years and the standard deviation is 3.7 years. Assume the variable is normally distributed. Round intermediate z-value calculations to two decimal places and the final answers to at least four decimal places. Part: 0/2 Part 1 of 2 If a proofreader from the company is randomly selected, find the probability that his or her age will be between 36 and 37.5 years. P (36 < X < 37.5) = 8 0 回

STATISTICS & PROBABILITY  Direction: Solve the following problems.  Round off your answer to two decimal places. Use the percentage form and include the percentage symbol (%) The length of time needed to do a particular activity is normally distributed with a mean of 2 hours and a standard deviation of 1.25 hours. What is the probability that a randomly selected student will spend 3.5 hours in doing the activity? The monthly food expenditure of a single person is 3000Php on average with a standard deviation of 300Php. Assuming that the monthly food expenditure is normally distributed, what percentage of these expenditures are between 2400Php and 4000Php?   Find the area to the right of z = 1.37 Select one: A. 8.53% B. 43.45% C. 31.76% D. 47.88%   Find the area between z = 0.46 and z = 2.56 Select one: A. 43.45% B. 31.76% C. 30.15% D. 97.98%   Find the area between z = 0 and z = -2.03 Select one: A. 43.45% B. 47.88% C. 8.53% D. 31.76% Find the area to the left…

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Qualifying Test Scores To qualify for a medical study, an applicant must have a systolic blood pressure in the 70% of the middle range. If the systolic blood pressure is normally distributed with a mean of 120 and a standard deviation of 3, find the upper and lower limits of blood pressure a person must have to qualify for the study. Round final answers to one decimal place.     Applicants must have a lower blood pressure limit of     and an upper blood pressure limit of     to qualify for the study.

Heart Rates For a certain group of individuals, the average heart rate is  70  beats per minute. Assume the variable is normally distributed and the standard deviation is  4  beats per minute. If a subject is selected at random, find the probability that the person has the following heart rate. Use a graphing calculator. Round the answers to four decimal places.   Part: 0 / 3 0 of 3 Parts Complete   Part 1 of 3       Between  65  and  73  beats per minute.   =P<65<X73       ??

The average amount of snow per season in Trafford is 45 inches. The standard deviation is 5 inches. Use a graphing calculator to find the probability that next year Trafford will receive the given amount of snowfall. Assume the random variable is normally distributed. Round your answers to 3 decimal places. Part: 0/2 Part 1 of 2 (a) Find the probability Trafford will receive at most 54 inches of snow. The probability that Trafford will receive at most 54 inches of snow is X

Electricity bills: According to a government energy agency, the mean monthly household electricity bill in the United States in  2011  was  $108.87 . Assume the amounts are normally distributed with standard deviation  $18.00 . Use Excel to answer the following. Round the answer to four decimal places. Part: 0 / 3 0 of 3 Parts Complete   Part 1 of 3     (a) What proportion of bills are greater than  $134 ? The proportion of bills that are greater than  $134  is    .       Part: 1 / 3 1 of 3 Parts Complete   Part 2 of 3     (b) What proportion of bills are between  $83  and  $145 ? The proportion of bills that are between  $83  and  $145  is    .       Part: 2 / 3 2 of 3 Parts Complete   Part 3 of 3     (c) What is the probability that a randomly selected household had a monthly bill less than  $118 ? The probability that a randomly selected household had a monthly bill less…

Electricity bills: According to a government energy agency, the mean monthly household electricity bill in the United States in  2011  was  $109.77 . Assume the amounts are normally distributed with standard deviation  $22.00 . Use Excel to answer the following. Round the answer to four decimal places. Part: 0 / 3 0 of 3 Parts Complete   Part 1 of 3     (a) What proportion of bills are greater than  $137 ? The proportion of bills that are greater than  $137  is.

Page > of 3 The Environmental Protection Agency (EPA) fuel economy estimates for automobile models tested recently predicted a mean of 27.8 miles per gallon, with a standard deviation of 4.2 miles per gallon. Assume that a Normal model applies. Find the probability that a randomly selected automobile will average: 1. Less than 24 miles per gallon. 2. More than 19 miles per gallon. 3. Between 24 and 30 miles per gallon. 45°F Cloudy here to search (25

Sample size = 16 Standard deviation = 12 %3D %3D Mean = 90 Find the probability that the sample mean is between 88 and 94.