ACET (Actuarial Common Entrance Test) Statistics: Questions 151 - 156 of 201

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Question number: 151

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MCQ▾

Question

Calculate coefficient of correlation from the following data using Karl Pearson’s method-

 X 1 2 3 4 5 Y 8 6 7 5 5

Choices

Choice (4)Response

a.

0.82

b.

0.75

c.

-0.75

d.

-0.90

Question number: 152

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MCQ▾

Question

What is the standard deviation of 10,16,10,16,10,10,16,16?

Choices

Choice (4)Response

a.

6

b.

4

c.

0

d.

3

Question number: 153

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MCQ▾

Question

A manager keeps a record of calls she makes each day on her mobile phone.

 No. of calls per day 0 1 2 3 4 5 6 Frequency 3 4 6 8 6 3 1

Calculate the mean number of calls per day.

Choices

Choice (4)Response

a.

2.83

b.

2.5

c.

2.97

d.

3

Question number: 154

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MCQ▾

Question

If the standard deviation of x is 3, what is the variance of (5 - 2x)?

Choices

Choice (4)Response

a.

9

b.

36

c.

1

d.

6

Question number: 155

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MCQ▾

Question

The mean and standard deviation of two series having frequencies 100 and 150 is 50 & 5 and 40 & 6 respectively. Find the average and the standard deviation of all the 250 items taken together.

Choices

Choice (4)Response

a.

50,7.80

b.

45,5.5

c.

44,7.45

d.

42,5.6

Question number: 156

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MCQ▾

Question

In how many ways can a team of 5 persons be formed out of a total of 10 persons such that two particular persons should not be included in any team?

Choices

Choice (4)Response

a.

112

b.

28

c.

56

d.

128

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