Friday, April 15, 2011

Data Handling (Mean from Frequency Table)

How to calculate Mean from Frequency Table

A. The process
Refer to the following link for information on the process.

B. Notation

B. Question:

source: http://www.mathsisfun.com

1. (15×1+27×2+8×3+5×4)÷15+27+8+5=2.054.....≈2
The mean is 2

2. The mean is 2 parking spaces, answer is rounded off

4. (15x1+27x2+8x3+5x4)/15+27+8+5=2.054545455.....
The answer is rounded off to 2.

5. ((15×1)+(27×2)+(8×3)+(4×5)) ÷ (15+27+8+4) =
(15+54+24+20) ÷ 54
113 ÷ 54 ≈ 2

The mean is 2

6. 15x1+27x2+8x3+5x3/15+27+8+4 = 2
= is equal to the estimation sign(wavy equal sign)
The mean is 2

7. (15x1)+(2x27)+(3x8)+(4x5)=113
113 /(15+27+8+5)=2.0545454
Round off to 2

8. ((1x15)+(2x27)+(3x8)+(4x5))÷(15+27+8+5) = 2.054 ≈ 2

9. When rounded off, the answer is 2.

10. 15x1+27x2+8x3+5x3/15+27+8+4 = 2.054...
rounded off is 2

11. mean=total/frequency
total=(1*15)+(2*27)+(3*8)+(4*5)
= 15+54+24+20
= 113
frequency=15+27+8+5
=55
mean=113/55
rounded off=2

the mean is 2.

12. （15x1)+(27x2)+(8x3)+(4x5)/15+27+8+5 = 113/55 rounded of=2

13. Mean= (1x15)+(2x27)+(3x8)+(4x5) / 15+27+8+5 = 2.0545454.... rounded off = 2

14. (15x1+27x2+8x3+4x5)/ (15+7+8+5)=2.054545...rounded off to nearest whole number= 2

15. (15×1+27×2+8×3+5×4)÷15+27+8+5=2.05454545454...≈2