What percentage of the checkout times was less than 3 minutes? - 94769

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Request Description
Checkout Time (in minutes) Frequency 1.0 - 1.9 5 2.0 - 2.9 6 3.0 - 3.9 4 4.0 - 4.9 3 5.0 - 5.9 2 1. What percentage of the checkout times was less than 3 minutes? 2. Calculate the mean of this frequency distribution. 3. Calculate the standard deviation of this frequency distribution. 4. Assume that the smallest observation in this dataset is 1.2 minutes. Suppose this observation were incorrectly recorded as 0.12 instead of 1.2. Will the mean increase, decrease, or remain the same? Will the median increase, decrease or remain the same?
Solution Description

CI

Midpoint (x)

f

Relative f

fx

d = x - Mean

d^2

fd^2

0.95 – 1.95

1.45

5