Asked by vibhuti37 | 9th Jan, 2010, 07:36: PM

Expert Answer:

if getting a student good in maths is called a success,




prob (failure)=1-(1/2)=1/2

if out of 18, exactly 10 students are good in maths , so we have,

10 successes and 8 failures


the reqd prob distribution will be


for at least 10,

 you can consider,

10 successes, 11 successes..... 18 successes and write the answer in the same manner as above.

similarly for the other parts.

Answered by  | 10th Jan, 2010, 11:55: AM

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