Elementary Statistics, Chapter 2, Unit 1, Homework
Problems
1.48 individuals are included in the summary (add up all numbers in the
frequency column)
No. The data values in each class could take on any value between the class limits,
inclusive.: Refer to the table summarizing service times (seconds) of dinners
at a fast food restaurant. How many individuals are included in the summary? Is it
possible to identify the exact values of all of the original service times?
2.(divide a frequency (like 5) by the sum of frequencies, 41 and then multiply that by
100.)
12.20%, 24.39%, 43.90%, 12.20%, 7.32%: A frequency table of grades has five classes
(A, B, C, D, F) with frequencies of 5 , 10 , 18 , 5 , and 3 respect
percentages, what are the relative frequencies of the five classes?
3.The sum of the relative frequencies is 124%, but it should be 100%, which a small
possible round-off error. All of the relative frequencies appear to be roughly the
same. If they are from a normal distribution, they should start low, reach a
maximum, and then decrease.: Heights of adult males are known to have a normal
distribution. A researcher claims to have randomly selected adult males and measured
their heights with the resulting relative frequency distribution as shown here. Identify two
major flaws with these results.
4.lower class limits: 25, 35, 45, 55, 65, 75, 85
upper class limits: 34, 44, 54, 64, 74, 84, 94
class width: 10 (34-25+1)
class midpoints: 29.5, 39.5, 49.5, 59.5, 69.5, 79.5, 89.5
class boundaries: 34.5, 44.5, 54.5, 64.5, 74.5, 84.5, 94.5 (don't forget to find the lowest
class boundary which is 24.5)
number of individuals included included in the summary: 90: Identify the lower class
limits, upper class limits, class width, class midpoints, and class boun
for the given frequency distribution. Also identify the number of individuals included in the
summary.
Age (yr) when award was won: 25-34, 35-44, 45-54, 55-64, 65-74, 75-84, 85-94
Frequency: 29, 34, 16, 3, 5, 1, 2
5.lower class limits: 0, 100, 200, 300, 400, 500, 600
upper class limits: 99, 199, 299, 399, 499, 599, 699
class width: 100
class midpoints: 49.5, 149.5, 249.5, 349.5, 449.5, 549.5, 649.5
class boundaries: -0.5, 99.5, 199.5, 299.5, 399.5, 499.5, 599.5, 699.5
number of individuals: 154: Identify the lower class limits, upper class limits, c
width, class midpoints, and class boundaries for the given frequency distribution.
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Problems
1.48 individuals are included in the summary (add up all numbers in the
frequency column)
No. The data values in each class could take on any value between the class limits,
inclusive.: Refer to the table summarizing service times (seconds) of dinners
at a fast food restaurant. How many individuals are included in the summary? Is it
possible to identify the exact values of all of the original service times?
2.(divide a frequency (like 5) by the sum of frequencies, 41 and then multiply that by
100.)
12.20%, 24.39%, 43.90%, 12.20%, 7.32%: A frequency table of grades has five classes
(A, B, C, D, F) with frequencies of 5 , 10 , 18 , 5 , and 3 respect
percentages, what are the relative frequencies of the five classes?
3.The sum of the relative frequencies is 124%, but it should be 100%, which a small
possible round-off error. All of the relative frequencies appear to be roughly the
same. If they are from a normal distribution, they should start low, reach a
maximum, and then decrease.: Heights of adult males are known to have a normal
distribution. A researcher claims to have randomly selected adult males and measured
their heights with the resulting relative frequency distribution as shown here. Identify two
major flaws with these results.
4.lower class limits: 25, 35, 45, 55, 65, 75, 85
upper class limits: 34, 44, 54, 64, 74, 84, 94
class width: 10 (34-25+1)
class midpoints: 29.5, 39.5, 49.5, 59.5, 69.5, 79.5, 89.5
class boundaries: 34.5, 44.5, 54.5, 64.5, 74.5, 84.5, 94.5 (don't forget to find the lowest
class boundary which is 24.5)
number of individuals included included in the summary: 90: Identify the lower class
limits, upper class limits, class width, class midpoints, and class boun
for the given frequency distribution. Also identify the number of individuals included in the
summary.
Age (yr) when award was won: 25-34, 35-44, 45-54, 55-64, 65-74, 75-84, 85-94
Frequency: 29, 34, 16, 3, 5, 1, 2
5.lower class limits: 0, 100, 200, 300, 400, 500, 600
upper class limits: 99, 199, 299, 399, 499, 599, 699
class width: 100
class midpoints: 49.5, 149.5, 249.5, 349.5, 449.5, 549.5, 649.5
class boundaries: -0.5, 99.5, 199.5, 299.5, 399.5, 499.5, 599.5, 699.5
number of individuals: 154: Identify the lower class limits, upper class limits, c
width, class midpoints, and class boundaries for the given frequency distribution.
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