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Sagot :
Answer:
- The mean is 26
Step-by-step explanation:
The frequency table according to the graph looks like
- Range | 0-10 10-20 20-30 30-40 40-50
- Frequency | 6 8 12 4 10
Total number of frequencies is
- 6 + 8 + 12 + 4 + 10 = 40
Sum of data, using the midpoint of frequency ranges
- 6*5 + 8*15 + 12*25 + 35*4 + 45*10 = 1040
The mean is the average of data
- 1040/40 = 26
Midpoints of frequency ranges
- 0+10/2
- 10/2
- 5
They are
- 5,15,25,35,45
Now
sum of frequencies
- 6+8+12+4+10
- 40
Mean:-
- 6(5)+8(15)+12(25)+4(35)+10(45)/40
- 30+120+300+140+450/40
- 1040/40
- 26
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