Find the expected value of the random variable in the experiment.A bag contains six marbles, of which four are red and two are blue. Suppose two marbles are chosen at random and X represents the number of red marbles in the sample.
A. 1.4
B. 0.933
C. 1.33
D. 1
Answer: C
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Find, if possible, the whole number that makes the equation true.140 ÷ 20 = 
A. No whole number B. 20 C. Any whole number D. 7
Write an equation that expresses the relationship. Use k as the constant of variation.d varies jointly as s and h.
A. d = 
B. d = kskh
C. d = 
D. d = ksh
At one high school, students can run the 100-yard dash in an average of 15.2 seconds with a standard deviation of .9 seconds. The times are very closely approximated by a normal curve. Find the percent of times that are indicated. Round to the nearest whole percent.Less than 17 seconds
A. 98% B. 3% C. 98% D. 84%
Solve the problem.The price of electric guitars has varied considerably in recent years. The data in the table relates the price P, in dollars, to time t, in years, where t = 1 corresponds to 1988. Use a cubic function fitted to the data to predict the price of an electric guitar in 1997. Average price, p, 
A. $670.48 B. $893.53 C. $827.42 D. $443.52