Mathematics

Question 1 of 20

What type of probability uses sample spaces to determine the numerical probability that an event will occur?

 A.classical probability
 B.subjective probability
 C.conditional probability
 D.empirical probability
Question 2 of 20

If A and B are any two events with P(A) = .8 and f$P(B|ar{A})= .7f$then f$P(ar{A}igcap{B})f$is:

 A.0.14
 B.0.875
 C..24
 D.0.56
Question 3 of 20

In a genetics experiment 5 flowers out of 8 were bicolor, and the rest were solid color. If 3 of the flowers are selected at random without replacement, what is the probability that all 3 are bicolor?

 A.0.375
 B.0.2441
 C.0.625
 D.0.1786
Question 4 of 20

If one tosses a coin enough times, the proportion of “heads” will approach 0.5. This is an example of:

 A.the Central Limit Theorem
 B.subjective probabilities
 C.the Law of Large Numbers
 D.the Empirical Rule
Question 5 of 20

If a die is rolled one time, find the probability of getting a number greater than 2.

 A.2
 B.-1
 C.5/6
 D.4/6
Part 2 of 6 –
Question 6 of 20

The following data were obtained from a survey of college students. The variable X represents the number of non-assigned books read during the past six months.

x 0 1 2 3 4 5
P (X=x) 0.20 0.25 0.20 0.15 0.10 0.10

Find P( X f$leq f$ 5)

 A.1.00
 B.0.10
 C.0.20
 D.0.90
Question 7 of 20

The following data were obtained from a survey of college students. The variable X represents the number of non-assigned books read during the past six months.

x 0 1 2 3 4 5
P (X=x) 0.20 0.25 0.20 0.15 0.10 0.10

What is the expected value of X?

 A.6.25
 B.2.0
 C.1.20
 D.3.65
Question 8 of 20

If a student randomly guesses at 20 multiple-choice questions, find the probability that the student gets exactly four correct. Each question has four possible choices.

 A.0.19
 B.0.17
 C.0.08
 D.0.23
Question 9 of 20

The variance of a binomial distribution for which n = 100 and p = 0.20 is:

 A.20
 B.16
 C.100
 D.80
Question 10 of 20

Which term is NOT synonymous with the expected value of a discrete probability distribution?

 A.mean
 B.μ
 C.variance
 D.theoretical average
Part 3 of 6 –

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