Old account balance
transaction
amount
new account
balance
account
1
352
-48
304
account
2
432
512
account
75
3
-100
account
4
52
12
account
5
-10
-20

Need on this geometry question. explain how you did it.

The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%

What is the circumference of a circle with an area of 50.24 cm²?