Question

The mean of 11 obervation is found to be 35. Each observation is then changed to 15 less than 4 times the original observation . What is the mean of new observation

Answer 1

Mean = 35

No. of observations = 11

Sum of observations = 11×35 = 385

Let the observations be x1, x2, .... , x11

Therefore, new mean = 4x1 - 15, 4x2 - 15, ...... , 4x11- 15 / 11

=> 4(x1, x2,.....x11) - 11(15)/11

We took 4 and -15 common

=> 4(385) -11(15) / 11

=>1540 - 165 / 11

=>1325 / 11

=>125

Therefore, new mean = 125

Answer 2

Answer:

the final answer is 125

thank you:))