C=pi(d)
So d=7ft
Then pi(7ft)=21.98
Answer:37
Step-by-step explanation:sorry if its worng
The estimated portion of light bulbs that last more than 500 hours will be
x=∑xn=224/430=0.521=52.1%
The answer of your problem is C. Because 25 and 100 are related integers.