Americans receive an average of 15 Christmas cards each year. Suppose the number of Christmas cards is normally distributed with a standard deviation of 7. Let X be the number of Christmas cards received by a randomly selected American. Round all answers to 4 decimal places where possible. a. What is the distribution of X? X - N( b. If an American is randomly chosen, find the probability that this American will receive no more than 13 Christmas cards this year. c. If an American is randomly chosen, find the probability that this American will receive between 18 and 23 Christmas cards this year.

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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Americans receive an average of 15 Christmas cards each year. Suppose the number of Christmas cards is normally distributed with a standard deviation of 7. Let X be the number of Christmas cards received by a randomly selected American. Round all answers to 4 decimal places where possible.

a. What is the distribution of X? \( X \sim N(\, \_\_\_\_\_ \,, \, \_\_\_\_\_ \, ) \)

b. If an American is randomly chosen, find the probability that this American will receive no more than 13 Christmas cards this year. \(\_\_\_\_\_\)

c. If an American is randomly chosen, find the probability that this American will receive between 18 and 23 Christmas cards this year. \(\_\_\_\_\_\)

d. 73% of all Americans receive at most how many Christmas cards? (Please enter a whole number) \(\_\_\_\_\_\)
Transcribed Image Text:**Text:** Americans receive an average of 15 Christmas cards each year. Suppose the number of Christmas cards is normally distributed with a standard deviation of 7. Let X be the number of Christmas cards received by a randomly selected American. Round all answers to 4 decimal places where possible. a. What is the distribution of X? \( X \sim N(\, \_\_\_\_\_ \,, \, \_\_\_\_\_ \, ) \) b. If an American is randomly chosen, find the probability that this American will receive no more than 13 Christmas cards this year. \(\_\_\_\_\_\) c. If an American is randomly chosen, find the probability that this American will receive between 18 and 23 Christmas cards this year. \(\_\_\_\_\_\) d. 73% of all Americans receive at most how many Christmas cards? (Please enter a whole number) \(\_\_\_\_\_\)
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