Answered: The lengths of pregnancies in a small…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Question

The lengths of pregnancies in a small rural village are normally distributed with a mean of 261 days and a standard deviation of 16 days.

In what range would we expect to find the middle 98% of most lengths of pregnancies? Round the answer to one decimal place.

Between and days

If we were to draw samples of size 40 from this population, in what range would we expect to find the middle 98% of most averages for the lengths of pregnancies in the sample? Round the answer to one decimal place.

Between and days

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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