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.
Answers: 2
Mathematics, 21.06.2019 18:30, singlegirlforlife541
Maria walks a round trip of 0.75 mile to school every day. how many miles will she walk in 4.5 days
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Mathematics, 21.06.2019 19:10, lays20001
Which situation can be modeled by the inequality 5 + 10w ≥ 45? a. you start with $5 and save $10 a week until you have at least $45. b. you start with 5 baseball cards and purchase 10 cards every week until you have at most 45 cards. c. you start with 5 water bottles and purchases cases of 10 water bottles each until you have a total of 45 water bottles. d. you spend $5 plus $10 per week until you have less than $45.
Answers: 3
Mathematics, 21.06.2019 19:30, thisusernameistaken2
Complete the solution of the equation. find the value of y when x equals to 1 9x-5y=29
Answers: 2
At the mall every day, thousands of people pass through security on one of two levels: level C or le...
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