subject
Mathematics, 04.06.2021 18:10 hopeeast8

At the mall every day, thousands of people pass through security on one of two levels: level C or level D. Suppose that, on average, it takes people 20 minutes to pass through security on level A with a standard deviation of 8.5 minutes to pass through security on level A. On level B, the mean and standard deviation are 18 and 6 minutes, respectively. Each day, the mall looks at separate random samples of 200 people from each level. They calculate the mean time for each sample, then look at the difference between the sample means (XA-XB) For boys, the average number of absences in the first grade is 15 with a standard deviation of 7; for girls, the average number of absences is 10 with a standard deviation of 6. Find the mean difference in the population and find the standard deviation of the difference. Sample for boys is 100 and girls is 50.

ansver
Answers: 2

Other questions on the subject: Mathematics

image
Mathematics, 21.06.2019 15:00, epicchicken420
Three coins are flipped. what is the probability that there will be at least two tails?
Answers: 1
image
Mathematics, 21.06.2019 17:50, AdanNava699
Find the cosine function that is represented in the graph.
Answers: 1
image
Mathematics, 21.06.2019 20:30, tatipop49
In an improper fraction, is the numerator equal to, less than, or greater than the denominator
Answers: 2
image
Mathematics, 21.06.2019 23:30, joelpimentel
Which choice has the correct steps in graphing the solution set to the following inequality? -45_> 20x-5y
Answers: 1
You know the right answer?
At the mall every day, thousands of people pass through security on one of two levels: level C or le...

Questions in other subjects:

Konu
Mathematics, 04.12.2020 01:00
Konu
Mathematics, 04.12.2020 01:00
Konu
Mathematics, 04.12.2020 01:00