Question

The ages of 11 students enrolled in an on-line macroeconomics course are given in the following steam-and-leaf display:

Stem |	Leaf
-----	-----------------------
1	9    9
2	1    5    5    8    9
3	0    1    2
4	8

Here 1|9 implies 19 years (i.e. the stem represents tens and leaf represents units).

Suppose there are x number of students who are 29 years old. Then x =

3

2

1

4

Tries 0/3

The IQR (Inter Quartile Range) of the age is:

10 years

21 years

31 years

11 years

Tries 0/3

For the age distribution
the median is 28 years and the mean is 27.91
the median is 28 years and the mean is 19
the median is 27.91 years and the mean is 28

Tries 0/3

The variance of the age distribution is

8.117 years

65.89 years

65.89 years2

8.117 years2

Answer 1

The IQR (Inter Quartile Range) of the age is: 10 years

For the age distribution

the median is 28 years and the mean is 27.91

The variance of the age distribution is:

65.89 years

Formula Ref: