Question

The data represent the ages of people working at a store.



19, 27, 20, 26, 20, 24, 32, 23, 20, 19, 21



What is the first quartile of these ages?

Answer 1

I think is 20, but i not sure

Answer 2

Have you arranged the data in ascending order, as the first step?

Answer 3

yes

Answer 4

I wrote all the numbers down from the least to the greatest

Answer 5

The lower quartile is the 25th percentile and has p = 0.25.
There are n = 11 observations, therefore np = 11 * 0.25 = 2.75 which is not a whole number. So rounding up we take the 3rd observation which is 20.

Answer 6

Thank you @kropot72 :))

Answer 7

You're welcome :)