Math Answers

The equation N(t) = 600/1 + 49e^0.7t models the number of people in a town who have heard a rumor after t days. As t increases without bound, what value does N(t) approach? Interpret your answer.

How many people started the rumor?   

N(t) approaches  number?

N(t)

 is limited by the number of poeple who started the rumor.

N(t)

 is limited by the carrying capacity of the town.

N(t)

 is limited by the rate at which the rumor spreads.

N(t)

 is limited by the number of days it takes for the entire population to hear the rumor.

N(t)

 is not limited by any value and increases without bound.

The weights of 1,000 children, in average, is 55kg with standard deviation of 17kg. Suppose the weights are normally distributed, how many children weigh greater than 38kg?

The weights of 1,000 children, in average, is 50kg with standard deviation of 14kg. Suppose the weights are normally distributed, how many children weigh between 53kg and 68kg?

An electrical firm manufactures light bulbs that have a length of life that is normally distributed with mean equal to 799 hours and a standard deviation of 49 hours. Find the probability that a bulb burns between 769 and 878 hours.

Given a standard normal distribution with mean =60 and standard deviation = 35, find P(X<75)

Given a standard normal distribution with mean =58 and standard deviation = 40, find P(X<96)

Given a standard normal distribution with mean =62 and standard deviation = 44, find P(X>92)

Given a standard normal distribution with mean =136 and standard deviation = 39, find P(X>84)

Given a standard normal distribution with mean =118 and standard deviation = 29, find P(76 < X < 144)

Given a standard normal distribution with mean =78 and standard deviation = 28, find P(85 < X < 102)