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
Expert Answer
Let A be the event of a class having at least 3 left-handed students.
n(A) = 12 + 8 + 2 = 22
Answered by | 09 Apr, 2014, 04:01: PM
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