The Mean of a Frequency Distribution

For a certain distribution,mode and median were found to be 100 and 1250 respectively. Find mean for this distribution using an empirical relation

• 1375

• 1265

• 1145

• 1550

It is assumed that the frequency of each interval is centred around its

• mid point

• lower limit

• upper limit

• none of the above

The relationship between mean, median and mode is

.............median = 2 .......... + ...........

• 2,median, mode

• 3,median, mode

• 2,mean, mode

• 3,mean, mode

Given this data distribution...(check all that apply)

• mean = median

• mean is greater than the median

• this data is skewed to the left

• this data is skewed to the right

Find the mean of the probability distribution.

• 85

• 83.2

• 87.1

• 84.4

The data presented in the table have a mean value of:

• 172

• 161

• 157

• 184

The table shows the distribution of the number of hours worked each week (on average) for a sample of 100 community college students. The mean

• 50

• 34.6

• 20

• 36.8

This data represents the age distribution of a sample of 100 people covered by health insurance (private or government). The sample was taken in 2003. The mean of this data set is

• 52

• 25

• 44

• 32

Find the midpoints.

• 25.5, 35.5, 45.5, 55.5, 65.5, 75.5

• 20.5, 30.5, 40.5, 50.5, 60.5, 70.5, 80.5

• 21, 31, 41, 51, 61, 71

• 30, 40, 50, 60, 70, 80

Estimate the mean of the histogram.

(a)