Q1) Which of the given describes the shape of distribution best?

a) Mean

b) Median

c) Mode

d) Standard deviation

e) Stem-and-leaf plot

Q2) _______________ gives us method of interpreting standard deviation whihc applies to any data set, regardless of shape of distribution.

a) Chebyshev's rule

b) The empirical rule

c) Both a and b

d) Neither a nor b

e) None of the above

Q3) A radio station claims that amount of advertising per hour of broadcast time has the average of 3 minutes and standard deviation equal to 2.1 minutes. You listen to radio station for 1 hour, at arbitrarily selected time, and carefully observe that amount of advertising time is equal to 7 minutes.

Compute z-score for this amount of advertising time.

a) z = 1.63

b) z = 1.90

c) z = 4.00

d) z = -1.90

e) z = 2.63