Answer:
2.802691 revolutions per second
Step-by-step explanation:
You can round to the nearest whole number making it 3 revolutions per second
To find the average, you have to add all the numbers up and then divide by the amount of numbers you added together.
Equation: (86+87+91+x)/4=98
Solve for x:
86+87+91+x=98*4
264+x=392
x=392-264
x=128
The fourth number is 128
