Question

Help please

Mary bought 12 of the Brand X batteries, how many of them lasted more than 14 hours? (Please
ow how you calculated this to get your answer)

Answer 1

• 9 batteries lasted more than 14 hours

Explanation:

Reading the box and whisker plot for Brand X, we identify that:

25% of batteries lasted for 10 - 14 hours and the rest lasted longer than 14 hours.

It means the number of batteries lasted more than 14 hours is:

• 12*(100 - 25)/100 = 12*3/4 = 9