What is the expectation for this probability distribution?

x p(x)

1 0.2

2 0.4

3 0.3

4 0.1

2.5

1.0

3.2

2.3

Other:

Five cards are dealt from a standard deck. What is the expected number of hearts?

20

135.2

2

1.25

Other:

In a six-question multiple-choice test, there are four possible answers for each question. For a person who guesses at each question, what is the expected number of correct answers?

1

2

1.5

3

Other:

A six-member jury is randomly chosen from 10 women and 14 men. What is the expected number of men on the jury?

4.4

7.5

3.5

2.7

Other:

When rolling a die 12 times, what is the expected number of times a 4 will show?

1

2

3

4

Other:

Earlier this year, 680 foxes were caught and tagged. In a recent survey, 40 out of 150 foxes that were caught had been tagged. What is the approximate size of the fox population?

3250

1620

2550

1040

Other:

A calculator is programmed to generate a random integer between 1 and 10. In six trials, what is the probability that the number 3 is generated exactly twice?

0.0043

0.0984

0.0249

0.0646

Other:

Jamaal scores on 65% of his free throws. What is the probability that he will make exactly 10 free throws out of 15 tries?

(0.65)(0.35)

C(15,10)(0.65)(0.35)

15(0.65)

C(15,10)(0.65)

Other:

A bag contains 8 red, 7 green, 5 black and 10 yellow jelly beans. Six jelly beans are selected at random without replacement. What is the probability that all six jelly beans are red?

8/30

C(8,6)/C(30,6)

6/8

8/C(8,6)

Other: