Questions on Algebra: Probability and statistics answered by real tutors!

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Question 155200: Consider the following frequency table of the performance ratings on a scale of 1–good, 2–fair, and 3–poor, bestowed on their local baseball team by a collection of 100 fans:
Rating -Frequency
1- 20
2- 30
3- 50

The cumulative relative frequencies for each performance rating are
a. 1–20%, 2–30%, 3–50%
b. 1–20%, 2–50%, 3–100%
c. 1–80%, 2–70%, 3–50%
d. 1–50%, 2–30%, 3–20%
: Consider the following frequency table of the performance ratings on a scale of 1–good, 2–fair, and 3–poor, bestowed on their local baseball team by a collection of 100 fans:
Rating -Frequency
1- 20
2- 30
3- 50

The cumulative relative frequencies for each performance rating are
a. 1–20%, 2–30%, 3–50%
b. 1–20%, 2–50%, 3–100%
c. 1–80%, 2–70%, 3–50%
d. 1–50%, 2–30%, 3–20%

Answer by stanbon(18999) About Me  (Show Source):
You can put this solution on YOUR website!
Consider the following frequency table of the performance ratings on a scale of 1–good, 2–fair, and 3–poor, bestowed on their local baseball team by a collection of 100 fans:
Rating -Frequency
1- 20
2- 30
3- 50
The cumulative relative frequencies for each performance rating are
a. 1–20%, 2–30%, 3–50%
b. 1–20%, 2–50%, 3–100%
c. 1–80%, 2–70%, 3–50%
d. 1–50%, 2–30%, 3–20%
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Cumulative relative frequency means "add successive frequencies".
1st 20
1st + 2nd = 50
1st + 2nd + 3rd = 100
That sequence of counting is seen in your answer "b"
Cheers,
Stan H.