The table shows information about the weekly earnings of 20 people who work in a shop. Weekly earnings (£x) Frequency
150 1
250 < x < 350
11
350 < x < 450
5
450 0
550 < x < 650
3
(a) Work out an estimate for the mean of the weekly earnings.

21 : 20

Step-by-step explanation:

*Change the unit from minute into second first

bashiru:

4 minutes x 60 = 240 seconds

(Explanation: because 1 minute have 60 seconds, then 4 minutes= 4 x 60 seconds)

240 seconds + 12 seconds = 252 seconds

kunle:

4minutes x 60 = 240 seconds

bashiru : kunle

252 : 240 ‹Simplify (divide by 12)

21 : 20

Thus, the answer is 21:20

Hope this helps ^_^