공업통계학 principles of statistics for engineers and scientists 1.2 1.3 2.1 2.2 2.3 장 연습문제 풀이

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본문내용

a. Find the sample mean number of children.
b. Find the sample standard deviation of the number of children.
c. Find the sample median of the number of children. Median is 50th value from highest. It is 2.
d. What is the first quartile of the number of the number of children? The first quartile is 75th value from highest. It is 0.
e. What proportion of the women had more than the mean number of children? The women who has more than 1.56, actually 2, are 51. so, proportion is 0.51
f. For what proportion of the women was the number of children more than one standard deviation greater than the mean? That value is 2.86. The women who has more than 2.86, actually 3, are 21.
so, proportion is 0.21
g. For what proportion of the women was the number of children within one standard deviation of the mean? That scope is 0.23~2.86. So, The women who has more than 0.23 and less than 2.26, actually 1 or 2 , are 52. Therefore, the proportion is 52%( 51/100 ).

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공업통계학 principles of statistics for engineers and scientists