Question

the mean of 35 numbers is 45. What will be the new mean if each of the 35 numbers is a. increased by 7? b. Decreased by 6? c. multiplied by 5? d. divided by 5​

Answer 1

Answer:

total sum= 35*45 = 1575

a) if each no increases by 7,then

new total sum=1575+7×35=1820

new mean=1820÷35=52

b) if each no decreased by 6,then

new mean=45-6=39

c) if each no multiplied by 5

new mean=45×5=225

d) if divided by 5

new mean=45÷5=9.