NCERT Mathematics Class 9 Exemplar Ch 14 Statistics and Probability Part 5

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26. In a survey of 364 children aged months, it was found that 91 liked to eat potato chips. If a child is selected at random, the probability that he/she does not like to eat potato chips is:

(A)

(B)

(C)

(D)

Answer: C

27. In a medical examination of students of a class, the following blood groups are recorded:

In a medical examination of students of a class

Blood group

A

AB

B

O

Number of students

10

13

12

5

A student is selected at random from the class. The probability that he/she has blood group B, is:

(A)

(B)

(C)

(D)

Answer: C

28. Two coins are tossed 1000 times and the outcomes are recorded as below:

Two coins are tossed 1000 times

Number of heads

2

1

0

Frequency

200

550

250

Based on this information, the probability for at most one head is

(A)

(B)

(C)

(D)

Answer: C

29. 80 bulbs are selected at random from a lot and their life time (in hrs) is recorded in the form of a frequency table given below:

80 bulbs are selected at random from a lot and their life time (in hrs)

Life time

(in hours)

300

500

700

900

1100

Frequency

10

12

23

25

10

One bulb is selected at random from the lot. The probability that its life is 1150 hours, is

(A)

(B)

(C)

(D)

Answer: C

30. Refer to Q.29 above:

The probability that bulbs selected randomly from the lot have life less than 900 hours is:

(A)

(B)

(C)

(D)

Answer: D