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StatisticsQ&A LibraryThe percent of fat calories that a person in America consumes each day is normally distributed with a mean of about 37 and a standard deviation of 10. Suppose that one individual is randomly chosen. Let X=percent of fat calories.a. What is the distribution of X? X ~ N(,)b. Find the probability that a randomly selected fat calorie percent is more than 45. Round to 4 decimal places.c. Find the minimum number for the lower quartile of fat calories. Round to 2 decimal places.Question

Asked Nov 15, 2019

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The percent of fat calories that a person in America consumes each day is normally distributed with a mean of about 37 and a standard deviation of 10. Suppose that one individual is randomly chosen. Let X=percent of fat calories.

a. What is the distribution of X? X ~ N(,)

b. Find the probability that a randomly selected fat calorie percent is more than 45. Round to 4 decimal places.

c. Find the minimum number for the lower quartile of fat calories. Round to 2 decimal places.

Step 1

**Standard normal distribution:**

The standard normal distribution is a special case of normal distribution, in which the mean of the distribution is 0 and standard deviation of the distribution is 1. That is X~N(µ, σ). The *Z*-scores can be calculated using the given formula

Step 2

**1.**

In this context, it is given that the average percent of fat calorie is 37 corresponding to its standard deviation of 10.

Denote X as the percent of fat calorie.

In this X follows normal with mean of 37 and standard deviation of 10. That is **X~N(37, 10).**

Step 3

**2.**

The probability that a randomly selected fat calori...

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