The question is in the diagram, Thankyou!
Answers
Answer:
3 and 2
Step-by-step explanation:
Find the total number of hours recorded by the 30 people:
average = 8.4 hours
Total = 8.4 x 30 = 252
Find the total number of hours recorded for 8 and 9 hours:
Total = (8 x 14) + (9 x 11)
Total = 211
Find the total number of hours recorded for 7 and 10 hours:
Total = 252 - 211
Total = 41
Find the total number of people that recorded their sleep as 7 and 10 hours:
Total number of people = 30
Total number of people left = 30 - 14 - 11
Total number of people left = 5
Since the number of people (Frequency) must be a whole number,
⇒ the only way to break up 41 is (7 x 3) + (10 x 2)
Therefore,
7 hours of sleep has frequency 3
10 hours of sleeps has frequency 2
Answer: 3 and 2
Answer is 3 and 2. You can solve this by direct method which is most applicable in this. Other methods will make you confuse.