Σx = 99, n = 9, Σ(x - 10)² = 79, then find,
(i) Σx²
(ii) Σ(x - \(\bar { x } \))²

Find the co-efficient of variation for the following data: 16, 13, 17,21, 18.

S.D. of a data is 2102, mean is 36.6, then find its C.V.

Team A	50	20	10	30	30
Team B	40	60	20	20	10

Which team is more consistent?

Final the probability of choosing a spade or a heart card from a deck of cards.