A departmental store had 150 television sets for sale during a 7-day period. The line graph shows the number of television sets left unsold at the end of each day. The number of television sets left unsold at the end of Day 7 was not shown.
- On which day was the greatest number of television sets sold? Give your answer in number. (Eg 1)
- The average number of television sets sold for the last three days was 13. How many television sets were sold on Day 7?
(a)
To find the greatest increase in the number of tickets sold, look for the steepest decreasing slope.
On Day 4, the number of television sets sold was the greatest number.
(b)
Total number of television sets sold for the last three days
= 3 x 13
= 39
Total number of television sets sold on Day 5 and Day 6
= 5 + 10
= 15
Total number of television sets sold on Day 7
= 39 - 15
= 24
Answer(s): (a) 4; (b) 24