Question

Hi there can anyone help me with this please

Answer 1

The answer is 85 let me explain:

All you do for the mean is add all the values(numbers) together, and then divide by the amount o f numbers.

so your number set is 

87,84,86,79,84,90

so all we do is add them all together

87 + 84 + 86 + 79 + 84 + 90

which equals 510

then we divide by the amount of values (numbers) there are.

since there are 6 numbers in this data set we have to divide  510 by 6

which gives us a quotient of 85

so 85  is your answer.