Question 3(1 point)

The mean amount of time needed to thaw a particular frozen dinner in the microwave in preparation for convection cooking is 5.68 minutes. The standard deviation of thaw times is 0.95 minute. If the thaw times are normally distributed, what proportion of the meals will take between 4.73 and 6.63 minutes to thaw?

Question 3 options:

a) 0.680

b) 0.482

c) 0.950

d) 0.758

Question 4(1 point)

Xis a normally distributed random variable withx= 125 andx= 12.5. What is P(X 110)?

Question 4 options:

a) 0.1151

b) 0.3849

c) 0.8849

d) 0.6151

Question 7(1 point)

In a(n) ____________ problem, certain characteristics of a population are assumed to be known. We then answer questions concerning a sample from that population.

Question 7 options:

a) statistical inference

b) inferential statistical

c) probability

d) statistics

Question 10(1 point)

A discrete random variable X has the distribution shown below:

Value of X 0 1 2

Probability 0.2. 0.4 0.4

The random variable Y is defined as Y = 2X + 10. What is the mean (expected value) of Y ?

Question 10 options:

a) 1.2

b) 2.4

c) 10

d) 12.4

e) there is not enough information