The time series graph gives some information about the number of umbrellas sold in a shop in the first six months of 2015.
The sales target for the first
100
six months of 2015 was to
sell a mean of 65 umbrellas
per month
80
Did the shop meet this target?
Show how you get your answer.
Number of umbrellas sold,
60
40
20
Jan
Feb
May
Jun
Mar Apr
Months

From the time-series, it is found that since the mean is below 65, the shop did not meet the target.

The mean of data-set is the sum of all observations divided by the number of observations.

From the time-series, there are 6 observations: 55, 85, 72, 90, 52, 25.

Hence, the mean is:

Since the mean is below 65, the shop did not meet the target.

A similar problem is given at link

Average is less than 65, therefore, shop did not meet the target.

Step-by-step explanation:

The time series graph gives some information about the number of umbrellas sold in a shop in the first six months of 2015.

From the given graph it is clear that the number of umbrellas sold in Jan, Feb, Mar, Apr, May, June are 54, 84, 72, 94, 52, 26 respectively.

Average sales is

Since, average is less than 65, therefore, shop did not meet the target.

a = 11 : 4

b = 38

c = 1 for every 6