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Bat Wings

Age 11 to 14 Short
Challenge Level
Here is a table of information about the wingspan of bats. Unfortunately, two entries are missing from the table.

Student Data set (wingspans in cm) Mean (cm)
A 13 - 16 12 10 15 13
B 13 16 - 13      

Student A collected 6 measurements and worked out that their mean was 13cm.
Student B collected 4 measurements.
The overall mean of the combined data was 13.4cm.

Can you work out what the two missing values are?


You can find more short problems, arranged by curriculum topic, in our short problems collection.