a.mean
Add all the numbers together and then divide by how much numbers there are in total
(10+18+21+55+48+23+24+25+32+43+10 )÷11
=309÷11
=28.1
b.median
Put the numbers in order then find the middle number.
10, 10, 18, 21, 23, 24, 25, 32, 43, 48, 55
the middle number is 24, so the median is 24.
c.mode
Since 10 occurs the most in the data, the mode is 10.