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Refer to the following breakdown of responses to a survey of "How confident are you that you saved enough to retire?"
Frequency
Response
Very confident
63
135
99
3
Somewhat confident
Not very confident
Don't know
What is the class interval for the preceding frequency table?
10
20
40
None Apply

Refer to the following breakdown of responses to a survey of How confident are you that you saved enough to retire Frequency Response Very confident 63 135 99 3 class=

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