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These are independent events but the prob is given for atleast.how to do this?

These are independent events but the prob is given for atleast.how to do this?

Question Image
Grade:12th pass

1 Answers

Yash Chourasiya
askIITians Faculty 256 Points
11 months ago
Hello Student

We have, Number of students failed in Physics = atleast70%
Number of students failed in Chemistry = atleast72%
Number of students failed in Mathematics = atleast80%
Number of students failed in English = atleast85%
⇒Number of students passed in Physics = atmost30%
Number of students passed in Chemistry = atmost28%
Number of students passed in Mathematics = atmost20%
Number of students passed in English = atmost15%
So,the number of students passed in all subjects = atmost(30+28+20+15)%
=atmost 93%
Hence, the number of students failed in all the four subjects = atleast(100−93)% = atleast7%.

I hope this answer will help you.

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