Answer:361.28
Step-by-step explanation:
This problem is all about just plugging in the numbers.
(I will be using the letters Pi to represent the actual number)
(Pi+(5*2))+(Pi*5*25)
10Pi+105Pi
115Pi
(Around) 361.28
He ran 2700 mins total in 12 weeks.
He ran 1800 laps in this time frame.
= 1800/2700 = 2/3 lap per minute x 60 min/hour
= 40 laps/hour average
The z-score for 5 minutes is found from:
Reference to a normal distribution table shows that the cumulative probability for a z-score of 1.667 is around 0.9522.
Therefore the probability that a conversation lasts for longer than 5 minutes is:
1 - 0.9522 = 0.048 to 3 d.p.
If you find the circumstance using the new radius, then the circumf will be longer than 15ft