Question

The mean of a data set is equal to 10. If we add 5 to each data value, then the mean become?

Answer 1

let the number of data be n

so sum of data = mean * number of data

= 10 n

now 5 is added to each data
so now sum becomes = 10n +5n = 15n

mean = sum of data /no. of data


= 15n/n = 15


so new mean becomes 15