# (1) (14 pts) The costs (in dollars) of 10 college math textbooks are listed belo

(1) (14 pts) The costs (in dollars) of 10 college math textbooks are listed belo
(1) (14 pts) The costs (in dollars) of 10 college math textbooks are listed below.
72 71 70 69 73 69 68 70 71
a) (4 points) Calculate the mean
b) (2 points) Find the median
68,69,69,70,70,70,71,71,72,73
c) (8 points) Calculate the sample standard deviation.
a) (5 points) The mean age and standard deviation of some respondents to a questionnaire are 74.0 and 9.7, respectively. If we assume that the distribution of ages is bell shaped, what percentage of the respondents will be between 64.3 and 93.4 years old?
b) Given the following sample data:
x
f
10.55
15
14.55
20
18.55
5
22.55
7
26.55
3
(5 points) Calculate the sample mean.
(8 points) Calculate the sample standard deviation.
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