The table shows the age, in years, of employees in a company.
Age (a) in years Frequency
18 < a < 20
3
20 < a < 22
2
22 < a < 24
7
24 < a < 26
8
26 0
a) Find the modal class interval.
Isac
b) Work out an estimate of the mean age of these employees.

a) The modal class for this case represent the class with the highest frequency

And for this case would be with the highest frequency 8

b)

Step-by-step explanation:

Part a

The modal class for this case represent the class with the highest frequency

And for this case would be with the highest frequency 8

Part b

For this case we need to find the mid point of each interval:

Interval   Midpoint  Frequency

18-20          19                 3

20-22         21                 2

22-24         23                 7

24-26         25                 8

And we can find the sample mean with this formula:

And replacing we got:

where is the triangle?

168

step-by-step explanation:

first off, we know that he drove 3.5 hours at a rate of 48 mph.

knowing that, we want to see how many miles he drove all-together.

in this case, we can just multiply 48 by 3.5.

48 * 3.5 = 168