Respuesta :

To find mean, add all of your given numbers, then divide by how many numbers you have in your data set.

87+93+86+90+84=440
440/5 (There are five numbers in your data set) is 88.

:)
WillieH
Hey there, 

Mean, is the Sum of all values/their number

Which means 
(87 + 93 + 86 + 90 + 84)/5

Simplify
440/5

which equals 88
that's the mean