Answer:
a) The mean income to 2 DP is £28142.86
b) The mean income excluding Deva's income is £19666.67
Explanation:
The formula for mean is,
m = sum of terms/number of terms
Now n = number of terms = number of people = 7
And in the sum, we will input their salaries, so we get,
a) m = (13500 + 27500 + 13750 + 79000 + 19250 + 29000 + 15000)/7
m = 197000/7
m = 28142.85714
to 2 DP, we get,
m = £28142.86
b) Excluding Deva's income, i.e. excluding 79000, and then, the number of people becomes 6, so we get the mean,
Mean without Deva's Income = (13500 + 27500 + 13750 + 19250 + 29000 + 15000)/6
Mean without Deva's Income = 118000/6
Mean without Deva's Income = 19666.66667
to 2 DP, we get,
Mean without Deva's Income = 19666.67
or,
Mean without Deva's Income = £19666.67