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CBSE Class 7 Answered

A survey was taken on 30 classes at a school to find the total number of left-handed students in each class. The table below shows the results: No. of left-handed students 0 1 2 3 4 5 Frequency (no. of classes) 1 2 5 12 8 2 A class was selected at random the probability that the class has at least 3 left-handed students
Asked by Topperlearning User | 09 Apr, 2014, 02:01: PM
answered-by-expert Expert Answer

Let A be the event of a class having at least 3 left-handed students.

n(A) = 12 + 8 + 2 = 22

P left parenthesis A right parenthesis equals 22 over 30 equals 11 over 15

Answered by | 09 Apr, 2014, 04:01: PM

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