Thread: Working out the mean

The times , in minutes, taken by 20 employees to complete a task are summaried by



using



then add 50 to 7 = 57 is the

but in the back of the book, it says 52.8.

Which one is right?

for the 52.8, it uses

then add 50.

again, Which one is right?

thanks for your help!

Originally Posted by BabyMilo

The times , in minutes, taken by 20 employees to complete a task are summaried by



using



then add 50 to 7 = 57 is the

but in the back of the book, it says 52.8.

Which one is right?

for the 52.8, it uses

then add 50.

again, Which one is right?

thanks for your help!

so divide by :



or:



which gives:



or:



CB