Change in the radius of the circle as the area increases from 3 square feet to 7 square feet ??? Help please
1 answer:
Answer:
The radius will change from 0.977 feet to 1.49 feet.
Step-by-step explanation:
The area of a circle with radius r is given by πr².
If the are of the circle is 3 square feet, then πr² = 3, ⇒ r²=
⇒ r² =0.9545, ⇒ r=0.977 feet.
If the area of the circle changes to 7 square feet, then its radius will change to r²= =2.228, ⇒ r =1.49 feet.
Therefore, the radius will change from 0.977 feet to 1.49 feet. (Answer)
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Answer:
the probability that more than 70% of customers in the sample will need additional maintenance is 0.0371
Step-by-step explanation:
From the information given:
we are to determine the probability that more than 70% of customers in the sample will need additional maintenance
In order to achieve that, let X be the random variable that follows a binomial distribution.
Then X Bin(48, 0.6)
However 70% of 48 samples is
= 0.7 × 48 = 33.6 34
Therefore, the required probability is:
= P(X> 34)
= 0.03709524328
0.0371