29 Conant High School has 17 students on its championship bowling team.
Each student bowled one game. The scores are listed in the accompa-
nying table.
(
x
)
(
f
)
Score
Frequency
i
i
140
4
145
3
150
2
160
3
170
2
180
2
194
1
Find, to the nearest tenth, the population standard deviation of these
scores.
How many of the scores fall within one standard deviation of the mean?
[14]
Math. B – June ’07