When estimating you need to round up or down to find something close to the real answer. Here we would round 1/8 down to 0 and 1/4 down to 0. So 0+0=0.
Your estimated answer is 0
The real answer is 3/8 so 0 is close and that is the point in estimating
Variance is the average of the square of the differences of each data with the mean. To calculate for the variance, we first calculate for the mean. Then, we subtract each data with the mean. Next, each difference would be squared and added. The resulting value would be divided on how many data are used. We calculate as follows:
Mean = <span>9 + 7 + 6.5 </span>+ 7.5 + 7 + 8 + 5 + 6 + 7.5 + 8 / 10
Mean = 6.4
Squared of the sum of the differences = (9-6.4)^2 + (7-6.4)^2 + (6.5-6.4)^2 + (7.5-6.4)^2 + (7-6.4)^2 + (8-6.4)^2 + (5-6.4)^2 + (6-6.4)^2 + (7.5-6.4)^2 + (8-6.4)^2 = 17.15
Variance = 17.15 / 10 = 1.715
2x-40=140
+40 +40
2x=180
————
2x
X=90
The correct answer would be 90 crayons
Bangle is 1.25 while Muffins are 1.749 9 repeating
