Please show work and formula used. A boat capsized and sank in a lake. Based on
ID: 3181345 • Letter: P
Question
Please show work and formula used.A boat capsized and sank in a lake. Based on an assumption of a mean weight of 141 lb, the boat was rate to carry 60 passengers (so the load limit was 8,460 lb). After the boat sank, the assumed mean weight for similar boats was changed from 141 lb to 172 lb. Complete parts a and b below. a. Assume that a similar boat is loaded with 60 passengers, and assume that the weights of people are normally distributed with a mean of 177.7 b and a standard deviation of 37.1 lb. Find the probability that the boat is overloaded because the 60 passengers have a mean weight greater than 141 lb. The probability is 1,0000. b. The boat was later rated to carry only 14 passengers, and the load limit was changed to 2,408 lb. Find the probability that the boat is overloaded because the mean weight of the passengers is greater than 172 (so that their total weight is greater than the maximum capacity of 2,408 lb.) The probability is 0.7173 Do the new ratings appear to be safe when the boat is loaded with 14 passengers? Choose the correct answer below. a. Because the probability of overloading is lower with the new ratings than with the old ratings, the new ratings appear to be safe. B. Because there is a high probability of overloading, the new ratings do not appear to be safe when the boat is loaded with 14 passengers. C. Because 177.7 is greater than 172, the new ratings do not appear to be safe when the boat is loaded with 14 passengers. D. Because there is a high probability of overloading, the new ratings appear to be safe when the boat is loaded with 14 passengers.
Explanation / Answer
Solution:
a) The probability is 1.0000
P(x>141) = P(z>(141- 177.7)/(37.1/60))
= P(z>-7.66)
= 1-P(z -7.66)
= 1-0 = 1
b) The probability is 1.0000
P(x>172) = P(z>(172- 177.7)/(37.1/14))
= P(z>-0.57)
= 1-P(z-0.57)
= 1-0.2843 = 0.7157
B. Because there is a high probability of overloading, the new ratings do not appear to be safe when the boat is loaded with 14 passengers.