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# Intervals and frequency tables

Don Larch, the manager of a popular local barbershop, has decided to evaluate the time required by his customers to obtain a haircut, pay, and depart. Doug borrowed the clock punch from one of the offices in the shopping center and asked the next 36 customers to punch in when they arrived at his shop and punch out after paying for their haircut. The following data was obtained (in minutes):
23 36 41 33 24 19 17 40
32 32 25 28 46 31 22 24
51 19 15 39 42 53 20 19
26 39 43 27 33 44 28 21
37 52 45 27
Doug chose the following classes for the data, (left end point excluded, right end point included):
14 - 21
21 - 28
28 - 35
35 - 42
42 - 49
49 - 56

Doug's frequency table contains ___________ class intervals.
a. 3
b. 4
c. 5
d. 6

The width of each class interval in Doug's frequency table is ___________ minutes.
a. 4
b. 5
c. 6
d. 7

How many customers are contained in the lowest (shortest time) class interval?
a. 7
b. 6
c. 5
d. 4

#### Solution Preview

Doug's frequency table contains ___________ class intervals.
a. 3
b. 4
c. 5
d. 6

Answer: (d) as there are six class ...

#### Solution Summary

Intervals and frequency tables for Don Larch are analyzed.

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