There were 48 SIDS cases in King County, Washington, during the years 1974 and 1975. The birthweights in grams) of these 48 case
1 answer:
Answer:
Mean=2891.125.
Standard deviation=623.3918
Step-by-step explanation:
Let X be the birth weights of SIDS cases in King County, Washington.
The appropriate last observation is 2863.(also confirmed by web search)
Sample mean=xbar=sumx/n
sumx=2466 +3941 +2807 +3118 +2098 +3175 +3515 +3317 +3742 +3062 +3033 +2353 +2013 +3515 +3260 +2892 +1616 +4423 +3572 +2750 +2807 +2807 +3005 +3374 +2722 +2495 +3459 +3374 +1984 +2495 +3062 +3005 +2608 +2353 +4394 +3232 +2013 +2551 +2977 +3118 +2637 +1503 +2438 +2722 +2863 +2013+ 3232 +2863
sumx=138774
Xbar=138774/48
Mean=Xbar=2891.125
X X-Xbar (X-Xbar)²
2466 -425.125 180731.2656
3941 1049.875 1102237.516
2807 -84.125 7077.015625
3118 226.875 51472.26563
2098 -793.125 629047.2656
3175 283.875 80585.01563
3515 623.875 389220.0156
3317 425.875 181369.5156
3742 850.875 723988.2656
3062 170.875 29198.26563
3033 141.875 20128.51563
2353 -538.125 289578.5156
2013 -878.125 771103.5156
3515 623.875 389220.0156
3260 368.875 136068.7656
2892 0.875 0.765625
1616 -1275.125 1625943.766
4423 1531.875 2346641.016
3572 680.875 463590.7656
2750 -141.125 19916.26563
2807 -84.125 7077.015625
2807 -84.125 7077.015625
3005 113.875 12967.51563
3374 482.875 233168.2656
2722 -169.125 28603.26563
2495 -396.125 156915.0156
3459 567.875 322482.0156
3374 482.875 233168.2656
1984 -907.125 822875.7656
2495 -396.125 156915.0156
3062 170.875 29198.26563
3005 113.875 12967.51563
2608 -283.125 80159.76563
2353 -538.125 289578.5156
4394 1502.875 2258633.266
3232 340.875 116195.7656
2013 -878.125 771103.5156
2551 -340.125 115685.0156
2977 85.875 7374.515625
3118 226.875 51472.26563
2637 -254.125 64579.51563
1503 -1388.125 1926891.016
2438 -453.125 205322.2656
2722 -169.125 28603.26563
2863 -28.125 791.015625
2013 -878.125 771103.5156
3232 340.875 116195.7656
2863 -28.125 791.015625
The sample standard deviation can be calculated as
sum(X-Xbar)² =180731.2656 +1102237.516 +7077.015625 +51472.26563 +629047.2656 +80585.01563 +389220.0156 +181369.5156 +723988.2656 +29198.26563 +20128.51563 +289578.5156 +771103.5156 +389220.0156 +136068.7656 +0.765625 +1625943.766 +2346641.016 +463590.7656 +19916.26563 +7077.015625 +7077.015625 +12967.51563 +233168.2656 +28603.26563 +156915.0156 +322482.0156 +233168.2656 +822875.7656 +156915.0156 +29198.26563 +12967.51563 +80159.76563 +289578.5156 +2258633.266 +116195.7656 +771103.5156 +115685.0156 +7374.515625 +51472.26563 +64579.51563 +1926891.016 +205322.2656 +28603.26563 +791.015625 +771103.5156 +116195.7656 +791.015625
sum(X-Xbar)² =18265013.25
Standard deviation=623.3918.
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Step-by-step explanation:
Answer:
Step-by-step explanation:
The tick marks you see on the sides denote congruence. If they have the same number of tick marks, then their side length are congruent.
And, recall that congruent side lengths have the same measure.
So, look at the sides with 2 tick marks. They are congruent. Therefore:
Subtract x from both sides:
Subtract 5 from both sides:
So, x is 7.
Now, look at the sides with only 1 tick mark. Again, they are congruent. Thus:
We already know x is 7. So:
Add:
Add 4 to both sides:
So, y is 16.