Question

Find the mean of the data summarized in the given frequency distribution. The highway speeds (in mph) of a random sample of cars are summarized in the frequency distribution below. Find the mean speed. Round your answer to one decimal place.

Answer 1

Answer:

Mean speed is 55.7 mph.

Step-by-step explanation:

The provided frequency distribution is:

Speed Cars

30-39 4

40-49 19

50-59 50

60-69 15

70-79 12

The formula to compute the mean for the grouped data is:

$\bar{X} =\frac{\sum(mf)}{\sum(f)}$

Here, m is mid point and f is frequency.

The mean speed can be computed as:

Thus, the mean speed is 55.7 mph.