Mathematics, 01.12.2019 00:31 rosaura15

a boat capsized and sank in a lake. based on an assumption of a mean weight of 133 lb, the boat was rated to carry 70 passengers (so the load limit was 9 comma 310 lb). after the boat sank, the assumed mean weight for similar boats was changed from 133 lb to 171 lb. complete parts a and b below.

a. assume that a similar boat is loaded with 70 passengers, and assume that the weights of people are normally distributed with a mean of 177.8 lb and a standard deviation of 40.6 lb. find the probability that the boat is overloaded because the 70 passengers have a mean weight greater than 133 lb.
the probability is
nothing.
(round to four decimal places as needed.)
b. the boat was later rated to carry only 15 passengers, and the load limit was changed to 2 comma 565 lb. find the probability that the boat is overloaded because the mean weight of the passengers is greater than 171 (so that their total weight is greater than the maximum capacity of 2 comma 565 lb).

the probability is
nothing.
(round to four decimal places as needed.)

do the new ratings appear to be safe when the boat is loaded with 15 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 15 passengers.
c.
because there is a high probability of overloading, the new ratings appear to be safe when the boat is loaded with 15 passengers.
d.
because 177.8 is greater than 171, the new ratings do not appear to be safe when the boat is loaded with 15 passengers.

Answers: 1

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a boat capsized and sank in a lake. based on an assumption of a mean weight of 133 lb, the boat was...

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