We are given that the incubation time is normally distributed with a mean of 35 days and standard deviation of 2 days. Therefore, ? =   and ? =   . We wish to determine how many of the 10,000 eggs can be expected to hatch in 31 to 39 days. Since  35 − 31 = 4,  31 days is located   standard deviations to the left of the mean. Similarly, 39 days is located   standard deviations to the right of the mean.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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We are given that the incubation time is normally distributed with a mean of 35 days and standard deviation of 2 days. Therefore, ? =   and ? =   .

We wish to determine how many of the 10,000 eggs can be expected to hatch in 31 to 39 days. Since 

35 − 31 = 4,

 31 days is located   standard deviations to the left of the mean. Similarly, 39 days is located   standard deviations to the right of the mean.

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