What is the total area under the standard normal distribution curve?

The normal distribution is described by the mean and standard deviation. Increasing the value of the standard deviation will have what effect on the shape of the distribution?

Given the contingency table shown here, find P(V). Cell Phone Service Provider County Sprint (S) AT&T (A) Verizon (V) Row Total Macomb (M) 17 25 8 50 Oakland (O) 19 38 13 70 Wayne (W) 24 37 19 80 Col Total 60 100 40 200

Determine the joint probability from the given probabilities. (Hint: use a probability tree) P(A)=.8  P(B|A)=.4 P(A’)=.2 P(B|A’)=.7 What is the P(A and B)?

A random variable 

Use the following table of joint probabilities to answer the question. (Note: there are 5 questions total throughout the exam that use this table, so you will come back to it again!)   A1 A2 B1 .10 .05 B2 .30 .55 What is P(A2 or B2)?

The discrete random variable X is the number of students that show up for Professor Smith’s office hours on Monday afternoons. The table below shows the probability distribution for X. What is the expected value E(X) for this distribution? X 0 1 2 3 Total P(X) .40 .30 .20 .10 1.00

Find the z-score that corresponds to a cummulative area of 0.4602. 

Use the following table of joint probabilities to answer the question. (Note: there are 5 questions total throughout the exam that use this table, so you will come back to it again!)   A1 A2 B1 .10 .05 B2 .30 .55 Given that event B2 has already occured, what is the probability of event A1 occuring?

The monthly sales at a computer store have a mean of $25,000 and a standard deviation of $4,000. Profits are 30% of the sales less fixed costs of $6,000. That is, Profit = .30(Sales)-6,000 What is the standard deviation of monthly profit?