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CBSE Notes 2011-2012 » IX-Maths-Term2

# Probability - ix

## To know the opinion of students about the chapter probability, a survey o f 2 0 0 students was condu...

Multiple choice question

To know the opinion of students about the chapter probability, a survey o f 2 0 0 students was conducted and the result was : students like the chapter : 160 students dislike the chapter : 40. Then the probability that a student likes the chapter is

## A die is thrown once, a number is noted, then the probability that it is a prime number is

Multiple choice question

A die is thrown once, a number is noted, then the probability that it is a prime number is

## Probability of getting a blue ball is 2/3, from a bag containing 6 blue and 3 red balls. 12 red ball...

Multiple choice question

Probability of getting a blue ball is 2/3, from a bag containing 6 blue and 3 red balls. 12 red balls are added in the bag, then the probability of getting a blue ball is

## In a class there are x boys and y girls, A student is selected at random, then probability of select...

Multiple choice question

In a class there are x boys and y girls, A student is selected at random, then probability of selecting a girl is

## The probabilities of a student getting A, B, C and D grade are 0.35, 0.25, 0.35 and 0.05, then the p...

Multiple choice question

The probabilities of a student getting A, B, C and D grade are 0.35, 0.25, 0.35 and 0.05, then the probability that a student gets at most grade C is

## While working out a question on probability it was formed that there were 286 letters of English alp...

Multiple choice question

While working out a question on probability it was formed that there were 286 letters of English alphabet. The following was observation of occurance of each letter a : 70, b : 14, e = 26, r : 40, i : 36 ; others (not including vowels) = 100 Then probability of a vowel is 