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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

Probability

A coin is tossed 4 times. Find the probability of getting at most 3 heads.

Solution not provided.
Ans. $15 over 16$

99 Views

A die is rolled thrice. What the probability of:

(a) not getting a six each time?

(b) getting the same number each time?

Solution not provided.
Ans. (a) $215 over 216$ (b) $1 over 36$

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Fill in the blanks in the following table:
P(A) P(B)

straight P left parenthesis straight A intersection straight B right parenthesis

straight P left parenthesis straight A union straight B right parenthesis

(i)

1 third

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1 over 15

..........
(ii) 0.35 ......... 0.25 0.6
(iii) 0.5 0.35 ......... 0.7

Solution not provided.
Ans. (i) $7 over 15$ (ii) 0.50 (iii) 0.15

114 Views

Arin has to visit at random three of his friends A, B and C over a week-end. What is the probability that he visits:

(a) B before C (b) B before C and C before A

(e) A either first or last?

Solution not provided.
Ans. (a) $1 half$ (b) $1 over 6$

(c) $1 third$ (d) $1 third$ (e) $2 over 3$

93 Views

Check whether the following probabilities are correctly defined:

(i) P (A) = 0.45, P(B) = 0.65, P (A ∩ B) = 0.55

(ii) P (A) = 0.6, P (B) = 0.7, P (A ∪ B) = 0.8

Solution not provided.
Ans. (i) No (ii) Yes

95 Views