Averages, and many other arithmetic topics, may be tested using charts and data. To find the numbers to
average, look them up on the graphic provided and watch out for mismatched units.
24.
Charge No. Battery Life
1 1:11
2 1:05
3 0:59
4 0:55
5 0:55
6 0:54
7 0:54A toy drone is opened and charged to full battery life. The table above shows the
duration of the battery life in hours and minutes between charges. What is the average
battery life for the first five charges?
A) 55 minutes
B) 58 minutes
C) 1 hour and 1 minute
D) 1 hour and 5 minutesHere’s How to Crack It
To find the average, add up the battery life values for the first 5 charges and divide by 5. Make sure that
you convert the battery charge time for Charge 1 and 2 into minutes before calculating: 1:11 = 60 + 11 =
71 minutes, and 1:05 = 60 + 5 = 65 minutes. The average is equal to =
61 minutes, which is equal to 1 hour and 1 minute. Therefore, (C) is the correct answer.
Don’t forget that you can also plug in when using the Average Pie.
16.The average (arithmetic mean) of a list of 5 numbers is n. When an additional number is
added to the list, the average of all 6 numbers is n + 3. Which of the following is the
value, in terms of n, of the number added to the list?