a sample of 480 teachers spent for their classes $ AMOUNT FREQUENCY 100-120 10 120-140 30...
a sample of 480 teachers spent for their classes $ AMOUNT FREQUENCY 100-120 10 120-140 30 140-160 80 160-180 120 180-200 150 200-220 70 220-240 20 Estimate the mean and the standard deviation interpret the mean and standard deviation for this study
Homework Answers
| AMOUNT | FREQUENCY |
| 100-120 | 10 |
| 120-140 | 30 |
| 140-160 | 80 |
| 160-180 | 120 |
| 180-200 | 150 |
| 200-220 | 70 |
| 220-240 | 20 |
Mean = SUMPRODUCT of Average of each amount * Frequency / Sum of Frequency
= (110*10+130*30+150*80+170*120+190*150+210*70+230*20)/480
= 177.5
Standard deviation = SQRT(((110-177.5)^2*10+(130-177.5)^2*30+(150-177.5)^2*80+(170-177.5)^2*120+(190-177.5)^2*150+(210-177.5)^2*70+(230-177.5)^2*20)/(480-1))
= 26.37
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a sample of 480 teachers spent for their classes $ AMOUNT
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