Question

The following figures are the heights in cms of 7 children chosen at random:
64, 59, 67, 69, 65, 70, 68
Calculate the simple arithmetic mean of the heights by (1) Direct Method, (i) Short-cut Method, and
(ii) Step Deviation Method.​

Answer 1

Answer:

(i) Calculating mean height using direct method: or, X=64+59+67+69+65+70+68/7. or, X =462/7 ⇒ X =66 cms