6
Q:

# Two cards are drawn at random from a well - shuffled pack of 52 cards. what is the probability that either both are red or both are queens?

 A) 17/112 B) 55/221 C) 55/121 D) 33/221

Explanation:

n(S) = $C252$ = 1326

Let  A = event of getting both red cards

and B = event of getting both queens

then $A∩B$ = event of getting two red queens

n(A) = $C226$ = 325,   n(B) = $C24$ = 6

$n(A∩B)=C22=1$

$PA∩B=11326$

$∴$P ( both red or both queens) = $PA∪B$

$PA+PB-PA∩B=$$3251326+1221-11326$=$55221$

Subject: Probability
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

Explanation:

Filed Under: Probability
Exam Prep: Bank Exams

8 569
Q:

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

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

Explanation:

Filed Under: Probability
Exam Prep: Bank Exams

2 466
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

Explanation:

Filed Under: Probability
Exam Prep: Bank Exams

2 530
Q:

A sequence , has odd number of terms. Then the median is

 A) axn2+1 B) axn2-1 C) axn-1 D) axn2

Explanation:

Filed Under: Probability
Exam Prep: Bank Exams

3 3460
Q:

The mean of a distribution is 15 and the standard deviation is 5. What is the value of the coefficient variation?

 A) 16.66% B) 66.66% C) 33.33% D) 100%

Explanation:

Filed Under: Probability
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5 726
Q:

If the standard deviation of a population is 3, what would be the population variance?

 A) 9 B) 6 C) 8 D) 15

Explanation:

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4 4123
Q:

The variance of a set of data is 169. Then the standard deviation of the data is

 A) +-13 B) 13 C) 69 D) 84.5

Explanation:

Filed Under: Probability
Exam Prep: Bank Exams

3 3409
Q:

If the standard deviation of a population is 10, what would be the population variance?

 A) 100 B) 30 C) 5 D) 20