Answer
average = 58.14
mean = 60
mode is 45 and 86
Work Step by Step
45, 86, 21, 60, 86, 64, 45
To find the mean, sum the numbers and divide by the count of numbers.
$mean=(45+86+21+60+86+64+45)\div7=407\div7=58.14$
The median is the number in the center when the numbers are written in order. Order the numbers from smallest to largest.
$21, 45, 45, \underline{60}, 64, 86, 86$
60 is in the center so is the median.
Both 45 and 86 appear twice, so the list has two modes.