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# The positive square root of variance is called: Select one: A. z-score B. mean C. Standard...

The positive square root of variance is called:

Select one:

A. z-score

B. mean

C. Standard Deviation

D. dispersion

QUESTION 12

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A cell phone company found that 75% of all customers want text messaging on their phones, 80% want photo capability, and 65% want both. What is the probability that a customer will want at least one of them?

Select one:

A. 0.90

B. 0.81

C. 0.87

D. 0.60

QUESTION 13

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Zulkifli, computer centre manager, reports that this computer system experienced three-component failure during the past 100 days. What is the probability of at least two failures in a 3-day period?

Select one:

A. 0.03

B. 0.91

C. 0.004

D. 0.08

QUESTION 14

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In the development of an oil site, the expert estimated the probability to 0.10 that economically recoverable reserves would exceed 2 billion barrels. The probability for reserves in excess of 1 billion barrels was estimated to be 0.50. Given this information, what is the estimated probability of reserves between 1 and 2 billion barrels?

Select one:

A. 0.60

B. 0.50

C. 0.40

D. 0.70

QUESTION 15

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Zulkifli, computer centre manager, reports that this computer system experienced three-component failure during the past 100 days. What is the probability of no failure?

Select one:

a. 0.004

b. 0.97

c. 0.03

d. 0.996

QUESTION 16

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What is nCn?

Select one:

A. 0

C. n

D. 1

QUESTION 17

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The slope of the regression equation for the following data is:

X 43 48 56 61 67 55
Y 128 120 135 143 141 130

Select one:

A. 0.8476

B. 0.8262

C. 0.7852

D. 0.6285

QUESTION 18

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A recent study showed that eating garlic can lower blood pressure is an example of:

Select one:

A. inferential statistics

B. inferential statistics and descriptive statistics

C. descriptive statistics

D. ordinal level

QUESTION 19

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The median for the data values “ 87, 85, 80, 78, 86, 90” is

Select one:

A. 87

B. 80

C. 84.1

D. 85

QUESTION 20

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A company receives a shipment of 20 items. Because inspection of each individual item is expensive, it has a policy of checking a random sample of 6 items from such a shipment, and if no more than 1 sampled item is defective, the remainder will not be checked. What is the probability that a shipment of 5 defective items will not be subjected to additional checking?

Select one:

A. 0.473

B. 0.516

C. 0.387

D. 0.129

1)-: Positive square root variance is known as standard deviation

Percentage of customers want messaging on phone = 75%

then probability of of customers want messaging on phone = 0.75 = P(A)

Percentage of customer want photo capability on phone=80%

It means probaility of customer want photo cabability is 0.80= P(B)

Similarly probability of customer want phone is given by 0.65 = P(AΠB)

Probability that customer want atleast one of them is given by P(AUB)

P(AUB) = P(A)+P(B)-P(AΠB) ------------(1)

Now putting above value in equation (1) we get

P(AUB)= 0.90

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