Question

In: Statistics and Probability

If the distribution of the weights of all people traveling by air between Dallas and El...

If the distribution of the weights of all people traveling by air between Dallas and El Paso is normal with μ = 163 pounds, and σ = 18 pounds, then

(a) What’s the distribution of the sample mean of the weight of 36 passengers? Be specific and provide the mean and variance.

(b) What is the probability that the sample mean of the weight of 36 passengers exceeds 170 pounds?

Solutions

Expert Solution

Given that, mean (μ) = 163 pounds and

standard deviation = 18 pounds

a) sample size (n) = 36

Since, sample size is large with known standard deviation, the sampling distribution of the sample mean is approximately normal.

Mean and variance of the sampling distribution of the sample mean are as follows :

=> Mean = 163 and Variance = 9

=> standard deviation = 3

b) We want to find,

Therefore, required probability is 0.0099


Related Solutions

1.) Bringing all of section 6.2 together... The distribution of passenger vehicle speeds traveling on the...
1.) Bringing all of section 6.2 together... The distribution of passenger vehicle speeds traveling on the Interstate 5 Freeway (I-5) in California is nearly normal with a mean of 72.6 miles/hour and a standard deviation of 4.78 miles/hour. (a) What percent of passenger vehicles travel slower than 80 miles/hour? % (round to two decimal places) (b) What percent of passenger vehicles travel between 60 and 80 miles/hour? % (round to two decimal places) (c) How fast do the fastest 5%...
All trucks traveling on Interstate 40 between Albuquerque and Amarillo are required to stop at a...
All trucks traveling on Interstate 40 between Albuquerque and Amarillo are required to stop at a weigh station. Trucks arrive at the weigh station at a rate of 200 per 8-hour day, and the station can weigh, on the average, 220 trucks per day. a. Determine the average number of trucks waiting, the average time spent waiting and being weighed at the weigh station by each truck, and the average waiting time before being weighed for each truck. b. If...
All trucks traveling on Interstate 40 between Alburquerque and Amarillo are required to stop at a...
All trucks traveling on Interstate 40 between Alburquerque and Amarillo are required to stop at a weigh station. Trucks arrive at the weigh station at a rate of 200 per 8-hour day, and the station can weigh, on the average, 220 trucks per day. Determine the average number of trucks waiting, the average time spent waiting and being weighed at the weigh station by each truck, and the average waiting time before being weighed for each truck. If the truck...
The following is the frequency distribution for the speeds of a sample of automobiles traveling on...
The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway. Speed (MPH) Frequency 50 - 54 2 55 - 59 4 60 - 64 5 65 - 69 10 70 - 74 9 75 - 79 5 35 Find the median and the mode.
There is an insurance pool of 1000 people. All are covered via community rating. The distribution...
There is an insurance pool of 1000 people. All are covered via community rating. The distribution of expected health care costs per person is shown in the table below. Number of people Expected health care claims 100 $0 100 $100 100 $200 100 $300 100 $400 100 $500 100 $600 100 $700 100 $800 100 $900 A. Year 1. Customers only buy insurance if their expected health care claims are higher than the premium. In the first year, 500 people...
A) The Acme Company manufactures widgets. The distribution of widget weights is bell-shaped. The widget weights...
A) The Acme Company manufactures widgets. The distribution of widget weights is bell-shaped. The widget weights have a mean of 57 ounces and a standard deviation of 8 ounces. Use the Empirical Rule and a sketch of the normal distribution in order to answer these questions. 68% of the widget weights lie between _____?____ and ______?______   What percentage of the widget weights lie between 41 and 65 ounces? What percentage of the widget weights lie above 33 ? B) The...
The Acme Company manufactures widgets. The distribution of widget weights is bell shaped. The widget weights...
The Acme Company manufactures widgets. The distribution of widget weights is bell shaped. The widget weights have a mean of 39 ounces and a standard deviation of 4 ounces. use the empirical rule. A) 95% of the widget weights lie between ___ and _____ B) what percentage of the widget weights lie between 35 and 47 ounces? ______% C) what percentage of the widget weight slide below 51? ____________%
The distribution of weights for an industrial part appears to follow a normal distribution. You randomly...
The distribution of weights for an industrial part appears to follow a normal distribution. You randomly selected 21 parts from a large batch of those parts, and determined the sample standard deviation = 4 g. If you want to test H0: σ2 = 16 versus Ha: σ2 ≠ 16, what is the absolute value of the test statistic you would use?
The figure above shows a portion of the trajectory of a ball traveling through the air....
The figure above shows a portion of the trajectory of a ball traveling through the air. Arrows indicate its momentum at several locations. At these locations, the ball's momentum is: B = ‹ 3.18, 2.88, 0 › kg·m/s C = ‹ 2.7, 1.02, 0 › kg·m/s D = ‹ 2.39, ?0.52, 0 › kg·m/s E = ‹ 2.12, ?1.88, 0 › kg·m/s (a) Which of the diagrams below correctly shows the graphical relationship between B , C , and ?...
The Acme Company manufactures widgets. The distribution of widget weights is bell-shaped. The widget weights have...
The Acme Company manufactures widgets. The distribution of widget weights is bell-shaped. The widget weights have a mean of 40 ounces and a standard deviation of 9 ounces. Use the Empirical Rule, find a) 99.7% of the widget weights lie between and b) What percentage of the widget weights lie between 22 and 67 ounces? % c) What percentage of the widget weights lie below 49 ? %
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT