Skip over navigation
Bat Wings
Age 11 to 14
ShortChallenge 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.
You may also like
Kate's Date
When Kate ate a giant date, the average weight of the dates decreased. What was the weight of the date that Kate ate?
Balancing the Books
How many visitors does a tourist attraction need next week in order to break even?
Grandpa's Rock Cakes
Grandpa made a super-heavy rock cake. Five people have guessed the weight of the cake. Can you work out the weight of his cake?