ACET (Actuarial Common Entrance Test) Statistics: Questions 56 - 59 of 81

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Question number: 56

» Discrete Distributions » Poisson

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MCQ▾

Question

Exclusive Vines import Argentinian wine into Australia. They’ve begun advertising on Facebook to direct traffic to their website where customers can order wine online. The number of click- through sales from the ad is Poisson distributed with a mean of 12 click through sales per day. The probability of getting exactly 10 click through sales in the first day is given by-

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 57

» Discrete Random Variables » Definitions

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Two variables are said to be perfectly negatively correlated if-

Choices

Choice (4)Response

a.

Coefficient of correlation between them is -1

b.

Covariance between them is positive

c.

Correlation coefficient is positive

d.

Correlation coefficient is negative

Question number: 58

» Measures of Spread » Standard Deviation

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The positive square root of the mean of the squares of the deviations of observations from their mean is known as-

Choices

Choice (4)Response

a.

Mean Deviation

b.

Variance

c.

Range

d.

Standard Deviation

Question number: 59

» Probabilities » Bayes Theorem

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A problem in statistics is given to three students A, B and C whose chances of solving it are , ¼ and ½ respectively. What is the probability that the problem will be solved?

Choices

Choice (4)Response

a.

b.

c.

d.

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