Baby weights: The weight of male babies less than 2 months old in the United States is normally distributed with mean 12.5 pounds and standard deviation 5.1 pounds. (a) What proportion of babies weigh more than 14  pounds? (b) What proportion of babies weigh less than 16 pounds? (c) What proportion of babies weigh between 11 and 15 pounds? (d) Is it unusual for a baby to weigh more than 17 pounds?

If your score on your next statistics test is converted to a z score, which of these z scores would you prefer: - 2.00, - 1.00, 0, 1.00, 2.00? Why? OA The z score of 1.00 is most preferable because it is 1.00 standard deviation above the mean and would correspond to an above average test score. O B. The z score of 0 is most preferable because it corresponds to a test score equal to the mean. OC. The z score of - 1.00 is most preferable because it is 1.00 standard deviation below the mean and would correspond to an above average test score. OD. The z score of 2.00 is most preferable because it is 2.00 standard deviations above the mean and would correspond to the highest of the five different possible test scores. O E. The z score of -2.00 is most preferable because it is 2.00 standard deviations below the mean and would correspond to the highest of the five different possible test scores. O Time MacBook PrO -> G Search or type URL esc ! @ #3 2$ % 2 4 6. 7 8 R Y P Q tab A S F G K caps…

The graph illustrates the distribution of test scores. The mean score was 73 and the standard deviation was 9. 46 55 64 73 82 91 100 Distribution of Test Scores Use the "Empirical Rule", not a calculator or other technology. a. What is the approximate percentage students who scored between 64 and 82 on the test? b. What Is the approximate percentage of students who scored between 55 and 91 on the test? 96 C. What is the approximate percentage of students who scored less than 55 on the test? d. What is the approximate percentage of students who scored between 73 and 82 on the test?

What proportion of babies weigh between 11.2 and 16 pounds?

Students in a class were given a quiz. These were their scores: 7   8   10   9   8   8   4   6   7   8   9   8   6   8   5 What is the standard deviation for these students' quiz scores?

Page 2 of 5 B. Organizing and Working with Data. 1. Find the z-score for the weight of a 155-pound woman. The mean weight of woman age 20 or older is 170.6 pounds with a standard deviation of 5.4 pounds. Round your answer to two decimal places.

Gestation Periods of Humans. Gestation periods of humans have a mean of 266 days and a standard deviation of 16 days. Let y denote the variable "gestation period" for humans.a. Find the standardized variable corresponding to y.b. What are the mean and standard deviation of the standardized variable?c. Obtain the z-scores for gestation periods of 227 days and 315 days. Round your answers to two decimal places.d. Interpret your answers in part (c).