The mean weight of 32 math students is 98.3 lb. If the students could all stand on the scale together, what would their total weight be?

2 Answers
Aug 10, 2016

#32*98.3#

Explanation:

The Expected total weight is
#E(X+Y+...) =E(X)+E(Y) +... #

in this case they have the same mean which is the expected weight so
#n*mu = 32*98.3#

Aug 11, 2016

#32 xx98.3 = 3,145.6 lb#

Explanation:

To work out the mean (what we understand as the 'average') we do the following;

#Mean = (" sum (total) of all the values")/("the number of values")" OR " " M=T/N#

As with other formulae in this form, we have 3 ways in which it can be used.

#M = T/N " "T = MxxN" " N = T/M#

Remember that we may add Totals , we may add Numbers , but we may NOT ADD MEANS!

The mean of 32 students is 98.3 lb What do we know?

There are 32 students.(N) The mean is 98.3 (M) #" " T = MxxN#

#rArr Total = 32 xx98.3 = 3,145.6 lb#