How can we use the concept:
Averages are used in everyday life by everyone. Teachers figuring out grades, managers figuring out budgets, parents figuring out sleep schedules for kids, spending money equally on children and spending equal time with sons and daughters. The formula for finding mean is:
Sample Math Problems
1. Find the mean of the following set of data:
18 20 27 35 37 22 21 32 31
Solution:
18 + 20 + 27 + 35 + 37 + 22 + 21 + 32 + 31 = 243/9 = 27
2. Lyla bought six toys for her cousins. The prices are listed below.
$9 $8 $7.60 $9 $10.60 $11. What was the average of her gift giving?
Solution:
$9 + $8 + $7.60 + $9 + $10.60 + $11 = 55.60/6 = 9.2
Lyla’s average gift cost $9.20.
3. Jack remembers 5 out of 6 of his math test scores. Can you help him figure out the last test grade, if his final average for the class is 82%?
91 77 80 78 87 ?
Solution:
413 + x = 6(82)
413 + x = 492 x = 79 The missing grade is 79.
4. Look at the following set of numbers: 5 7 9 5 6 8 23
By how much would the mean change if the outlier(the number that doesn’t belong)gets dropped from the set of data? Round all answers to the nearest whole number.
Solution:
5 + 7 + 9 + 5 + 6 + 8 + 23 = 63/7= 9
5 + 7 + 9 + 5 + 6 + 8 + 23 = 63/7= 9
