Answer:
Step-by-step explanation:
a) Colin's mean score:
Add up the 10 given run scores and then divide the sum by 10:
(18 + 12 + 6 + 1 + 21 + 10 + 21 + 18 + 20 + 7) / 10, or
134 / 10. Thus, Colin's mean score was 13.4.
b) After Colin has played his 11th game, his average becomes:
134 + 9
----------- = 143/11 = 13
11
