Question

Calculate the sample variance and sample standard deviation for the following frequency distribution of heart rates for a sample of American adults. If necessary, round to one more decimal place than the largest number of decimal places given in the data.

Class | Frequency |
---|---|

61 - 66 | 12 |

67 - 72 | 13 |

73 - 78 | 6 |

79 - 84 | 14 |

85 - 90 | 12 |

Answer #1

Calculate the sample standard deviation and sample variance for
the following frequency distribution of heart rates for a sample of
American adults. If necessary, round to one more decimal place than
the largest number of decimal places given in the data.
Heart Rates in Beats per Minute
Class
Frequency
61 -66
3
67 - 72
12
73 -78
8
79 - 84
9
85 - 90
8

Calculate the sample variance and sample standard deviation for
the following frequency distribution of heart rates for a sample of
American adults. If necessary, round to one more decimal place than
the largest number of decimal places given in the data.
Heart Rates in Beats per Minute
Class
Frequency
61 - 66
13
67 - 72
9
73 - 78
5
79 - 84
3
885 - 90
6

Calculate the sample variance and sample standard deviation for
the following frequency distribution of heart rates for a sample of
American adults. If necessary, round to one more decimal place than
the largest number of decimal places given in the data.
61 -66 10
67 -72 6
73 -78 14
79 -84 5
85 -90 14

Calculate the sample standard deviation and sample variance for
the following frequency distribution of scores in a statistics
class. If necessary, round to one more decimal place than the
largest number of decimal places given in the data.
Scores
Class
Frequency
56 - 64
13
65 - 73
9
74 - 82
4
83 - 91
10
92 - 100
6

Calculate the sample standard deviation and sample variance for
the following frequency distribution of final exam scores in a
statistics class. If necessary, round to one more decimal place
than the largest number of decimal places given in the data.
Final Exam Scores
Class
Frequency
51 - 6051 - 60
1010
61 - 7061 - 70
77
71 - 8071 - 80
1212
81 - 9081 - 90
1111
91 - 10091 - 100
1515

Calculate the sample standard deviation and sample variance for
the following frequency distribution of final exam scores in a
statistics class. If necessary, round to one more decimal place
than the largest number of decimal places given in the data.
Final Exam Scores
Class
Frequency
41 - 5241 - 52
1111
53 - 6453 - 64
66
65 - 7665 - 76
77
77 - 8877 - 88
1414
89 - 10089 - 100
99

Calculate the sample variance and sample standard deviation for
the following frequency distribution of heights in centimeters for
a sample of 8-year-old boys. If necessary, round to one more
decimal place than the largest number of decimal places given in
the data.
Heights in Centimeters
Class
Frequency
116.1 - 120.0
35
120.1 - 124.0
33
124.1 - 128.0
39
128.1 - 132.0
48
132.1 - 136.0
14
What is the sample variance and sample standard deviation?

1. The heart rates (beats per minute) of 20 people are as
follows:
60 60 65 66 66 67 70 72 75 76 76 77 80 80 81 82 82 84 85 86.
(a) Calculate the percentile rank for a person with a
score of 80.
(b) What does the percentile rank from (b)
mean?

TestScore
53
53
56
56
56
58
58
58
59
59
59
60
60
62
63
63
63
64
65
65
66
67
67
67
67
68
69
69
69
69
71
71
72
72
72
72
73
73
73
73
73
74
75
75
75
76
76
76
76
77
77
77
77
77
78
78
78
79
79
79
79
80
80
80
80
80
80
81
81
81
82
82
83
83
83
83
84
84
84...

Calculate the sample mean and sample variance for the following
frequency distribution of hourly wages for a sample of pharmacy
assistants. If necessary, round to one more decimal place than the
largest number of decimal places given in the data.
Hourly Wages (in dollars)
Class
Frequency
8.76-10.5
32
10.51-12.25
25
12.26-14
44
14.01-15.75
16
15.76-17.5
16

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