Answer:
Mean = 1.57
Variance=0.31
Step-by-step explanation:
To calculate the mean and the variance of the number of successful surgeries (X), we first have to enumerate the possible outcomes:
1) Both surgeries are successful (X=2).

2) Left knee unsuccessful and right knee successful (X=1).

3) Right knee unsuccessful and left knee successful (X=1).

4) Both surgeries are unsuccessful (X=0).

Then, the mean can be calculated as the expected value:

The variance can be calculated as:

Answer:
perimeter of Pentagon is 62 CM
perimeter of triangle is equal to 38 CM
perimeter of square is equal to 48 CM
therefore perimeter of one side of square is 48 divided by 4 is equal to 12 CM
perimeter of Pentagon is 62 CM
Answer:
1)=> x=22
2)=> x=16
Step-by-step explanation:
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