Refer to Exercise 4. Alejandro, who sent 92 texts, has a standardized score of z=1.89 . a.

Question:

Refer to Exercise 4. Alejandro, who sent 92 texts, has a standardized score of z=1.89 .

a. Interpret this z-score.

b. The standard deviation of the distribution of number of text messages sent over the past 24 hours by the students in Mr. Williams’s class is 34.15. Use this information along with Alejandro’s z-score to find the mean of the distribution.

Exercise 4.

According to a study by Nielsen Mobile, “Teenagers ages 13 to 17 are by far the most prolific texters, sending 1742 messages a month.” Mr. Williams, a high school statistics teacher, was skeptical about the claims in the article. So he collected data from his first-period statistics class on the number of text messages they had sent over the past 24 hours. Here are the data:

1 29 25 8 5 1 25 98 9 0 26 118 72 0 92 52 14 3 3 44 42