1)What can be said about a set of data when its standard deviation is zero?

a)If the data are ordered, they are very spread out from the mean.

b)All of the data appear with the same frequency.

c)If the data are ordered, they are very close to but different from the mean.

d)All of the data is equal to the mean.

2)For the following data, which measure of central tendency would be the LEAST useful?

Data: 4; 8; 11; 11; 11; 27; 27; 27; 27; 27; 1000

a)standard deviation

b)mode

c)mean

d)median