Suppose that the total daily carbohydrate intake for all boys age 13 to 15 years old in the US is normally distributed with a mean of 125 grams per thousand calories with the standard deviation of 25 grams per thousand calories. approximately what percent of boys in this age range have a daily carbohydrate intake between 100 and 175 grams per thousand calories? 81.5% 95% 68%

We have a distribution with a mean of ? = 35 and ? = 3.5. Find the raw score equivalents for the following z-scores: -3.01, -2.56, -1.21, 1.40, 2.77, 3.00

Assume the birth weights at a local hospital have a normal distribution with a mean of 110 oz and a standard deviation of 15 oz. a. What is the percentile rank for a baby who is 140 oz. b. According to the Empirical Rule what percent of babies will be heavier than 155oz?  c. According to the Empirical Rule what percent of babies would you expect to find between 80 oz and 125 oz?

Identify the data value corresponding to the indicated percentile. The amount of sleep an adult gets per day is normally distributed with a mean of 7 hours and a standard deviation of 1.5 hours. Five percent of adults sleep more than how many hours per day?

a. Population Mean: d. Population Standar- b. Sample Mean: e. Sample Variance: c. Population Variance: f. Sample Standard D 10. Is it possible for the standard deviation of a list of numbers to equal zero? If so, give an example data set with at least 4 values. If not, explain why not. 1. Suppose that the median house price in a community is $405,000. Does that n cost more than $405,000? Explain why or why not.

The incomes of math tutors in a tutoring center of a university are normally distributed with a mean of $1100 and a standard deviation of $150 what percentage of tutors earn less than $900 a month

At one college, GPA's are normally distributed with a mean of 3 and a standard deviation of 0.6. Fill in the blanks, 99.7% of GPAs are between ____ and ____.   A. 1.8, 4.2   B. 3, 3.6   C. 2.4, 3.6   D. 1.2, 4.8

Suppose you buy a new car whose advertised mileage is 20 miles per gallon​ (mpg). After driving your car for several​ months, you find that its mileage is 16.5 mpg. You telephone the manufacturer and learn that the standard deviation of gas mileages for all cars of the model you bought is 1.02 mpg. a. Find the​ z-score for the gas mileage of your​ car, assuming the advertised claim is correct. b. Does it appear that your car is getting unusually low gas​ mileage?       Question content area bottom Part 1 a. z=enter your response here ​(Round to two decimal places as​ needed.)

The duration of cigarette smoking has been linked to many diseases, including lung cancer and various forms of heart disease. Suppose we know that among men ages 30-34 who have ever smoked, the mean number of years they smoked is 12.8 with a standard deviation of 5.1 years. For women in this age group, the mean number of years in 9.3 with standard deviation of 3.2. Assume that the duration of smoking is normally distributed.  a. The 99th percentile of duration of cigarette smoking for men is i. 2.33   b)   The 15th percentile of duration of cigarette smoking for women is i. 1.04

The WAIS is an IQ test. Scores on the WAIS for the 20-34 age group are normally distributed with a mean 110 and a standard deviation of 25. Scores for the 60-64 age group are normally distributed with a mean of 90 and a standard deviation of 25.  Find the percent of 20-34-year-olds that have an IQ greater than 120.  a. 16% b. z= 0.4 or 40% c. 0.6554 or 65.54% d. 0.3446 or 34.46%