The following distribution gives the times taken by 25 students to solve a problem:

Find the probability that the time taken by a student to solve the problem lies in the interval 35–40 or 45–50.

The following table presents the number of literate females in a town:

Find the probability that a literate female in from age group 10–15.

73.

The distribution of weights (in kg) of 100 people is given below:

Weight (in kg)	Frequency
40-45	13
45-50	25
50–55	28
55-60	15
60-65	12
65-70	5
70-75	2

Find the probability that the weight of a people selected at random is in the class 45-50.

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The blood groups of 30 students of Class VIII are recorded as follows:

A, B, O, O, AB, O, A, O, B, A, O, B, A, O, O,
A, AB, O, A, A, O, O, AB, B, A, O, B, A, B, O.

Find the probability that a student of Class VIII selected at random has his blood group AB.

• 0.38
• 0.68
• 0.78
• 0.78

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• 1

• 1

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• 1

• 1