95
Q:

# Three unbiased coins are tossed.What is the probability of getting at least 2 heads?

 A) 1/4 B) 1/2 C) 3/4 D) 1/3

Answer:   B) 1/2

Explanation:

Here S= {TTT, TTH, THT, HTT, THH, HTH, HHT, HHH}.

Let E = event of getting at least two heads = {THH, HTH, HHT, HHH}.

P(E) = n(E) / n(S)

= 4/8= 1/2

Q:

If the standard deviation of 0, 1, 2, 3 ......... 9 is K, then the standard deviation of 10, 11, 12, 13 ........... 19 will be:

 A) K+1 B) K C) K+4 D) K+8

Answer & Explanation Answer: B) K

Explanation:
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1 762
Q:

The standard deviation of the set {10, 11, 12, 9, 8} is

 A) 1 B) √2 C) 2 D) 2√2

Answer & Explanation Answer: B) √2

Explanation:
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6 676
Q:

Find the range of the data 2, 1, 2, 3, 5, 4, 7, 3, 5, 2, 4.

 A) 5 B) 4 C) 3 D) 6

Answer & Explanation Answer: D) 6

Explanation:
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1 659
Q:

Find the median, mode and mean of 9, 5, 8, 9, 9, 7, 8, 9, 8.

 A) 9, 9, 9 B) 9, 8, 9 C) 8, 9, 8 D) 8, 9, 9

Answer & Explanation Answer: C) 8, 9, 8

Explanation:
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2 619
Q:

In the usual set notation,  =

 A) A∪B∪A∪C B) A∩B∪A∩C C) A∪B∩A∪C D) A∪B∩A∩C

Answer & Explanation Answer: C) A∪B∩A∪C

Explanation:
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0 2218
Q:

Find the range and mode of the data 17, 18, 28, 19, 16, 18, 17, 29, 18

 A) 12 and 18 B) 13 and 18 C) 12 and 17 D) 11 and 17

Answer & Explanation Answer: B) 13 and 18

Explanation:
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1 774
Q:

Find the standard deviation of {11, 7, 10,13, 9}

 A) 1 B) 2 C) 4 D) 5

Answer & Explanation Answer: B) 2

Explanation:
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2 797
Q:

A table tennis player, lost 12 games out of 18 games played. Calculate the games won in terms of decimal.

 A) 0.667 B) 0.067 C) 0.50 D) 0.333

Answer & Explanation Answer: D) 0.333

Explanation:
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3 849