Mathematics, 20.11.2020 06:20, 2alshawe201
Some newer phone provide a screen rome summary, which shows the amount of screen time for a user in a given week. A student would like to estimate the mean screen time for all phone users. she asks a random sample of 50 students at her school to share their screen time for the past 24 hours. the main screen time for The Chosen students is 2.73 hours. which statement is appropriate interpretation of the results
A. all students probably have screen time close to 2.73 hours
B. to obtain a better estimate of mean screen time more students should be surveyed
C. because of undercoverage 2.73 likely underestimates the mean screen time of all phone users
D. 2.73 hours is a suitable estimate for me screen time of all phone users because a random sample was taken
Answers: 2
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Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items
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At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?
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