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Questions

1

You have a small class - just 6 students.Their quiz 1 scores were 8,10,8,9,7, and 6.

2

What is the std deviation?

3

What is the coefficient of variation?

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5

You picked 6 students from your class.Their quiz 1 scores were 8,10,8,9,7, and 6.

6

What is the std deviation?

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8

There are two sets of numbers.Set 1 has a mean of 12 and Set 2 has a mean of 80? Which one is correct?

9

Set 1 std dev should be smaller than Set 2

10

Set 1 std dev should be larger than Set 2

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13

In a trial run, the 8 employees of your factory took, on average, 6, 7, 10, 12, 13, 18, 21, and 24 minutes respectively to assemble Part M.What is the 5-number summary?

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15

If the 5-number summary is -2, 24, 33, 42,74,what are the right and left whiskers?

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18

IfAandBare mutually exclusive events withP(A)=0.60, then findP(B).

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20

IfAandBare collectively exhaustive events withP(A)=0.60, then findP(B).

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22

If A and B are neither mutually exclusive nor collectively exhaustive events, And

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P(A)=25%, P(B)=35%, and P(A B) = 7%, then find P(A or B).

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25

A and B are independent events.If P(B) = .33 and P(A | B) = .29, then find P(A).

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27

P(M) = .34 and P(N) = .21.What will be P(MN)?

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29

From a deck of cards, find P(Jack U 10 | Hearts).

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31

Events A and B are mutually exclusive. Can they be Independent?

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33

If A and B are two events with P(A) = 0.9 and P(B|A) = 0.5, then what is P(A and B)?

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35

Two events A and B are said to be independent if P(A|B) = P(B|A).

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37

If P(B) = .7 and P(B|A) = .4, then P(A and B) must be .28

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39

An insurance company has collected the following data on the gender and marital status of 300 customers. Suppose that a customer is selected at random.

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45

Find the probability that the customer selected is female or divorced.

46

Is marital status independent of gender? Explain using probabilities

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48

80% of the people who get infected by a certain bacteria get better without any treatment as the immune system takes care of the bacteria. Those who fall ill are treated by antibiotics by a doctor and 90% of them get better. Those who don't get better need to be hospitalized. 95% of those hospitalized get home within a week. the rest Rest in Peace.

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50

If a person is infected by the bacteria, what are his / her chances of seeing a doctor?

51

If a person is infected by the bacteria, what are his / her chances of getting admitted in a hospital?

52

If a person is infected by the bacteria, what are his / her chances of dying?

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54

20% of a towns drivers are young (21 or under). The probability of getting a ticket for a young driver is 7% and for an older driver is 3%. You just observed a police officer giving a ticket to someone.

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56

What is the probability that this driver is a young driver?

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What is the probability this driver is an older driver?

58

What is the probability of someone getting a ticket in this town?

59

A driver has called you on the phone. What is the probability that he / she is a young driver?

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61

The Variance of the heights of the mango trees in your garden is 13 sq ft.What will be the variance in yards?

62

There are 20 customers in your restaurant.Probability of someone ordering wine is 25%.How many people you expect to order wine?

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64

There are 20 customers in your restaurant.Probability of someone ordering wine is 25%.What is the probability at least 2 but no more than 5 will order wine?

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66

You've a coin which is not fair.The probability of Heads is 0.52.If you toss it three times, what is the probability that you will get 2 or more Heads?