7. In a class, there are 18 students wearing spectacles. n students are randomly selected from the class. Given that the mean and the standard deviation of the number of selected students wearing are 3.6 and 1.2 respectively, find a. The value ofn, b. The total number of students in the class.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 13PPS
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Q7 Ans : a)6 ; b)30students
7. In a class, there are 18 students wearing spectacles. n students are randomly selected from the class.
Given that the mean and the standard deviation of the number of selected students wearing are 3.6 and
1.2 respectively, find
a. The value of n,
b. The total number of students in the class.
Transcribed Image Text:7. In a class, there are 18 students wearing spectacles. n students are randomly selected from the class. Given that the mean and the standard deviation of the number of selected students wearing are 3.6 and 1.2 respectively, find a. The value of n, b. The total number of students in the class.
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