ryndersava
23.10.2020 •
Mathematics
On average, a laptop battery lasts 120 minutes with a standard deviation of 4 minutes. 6 batteries are randomly selected for a quality control test.
1. Calculate the chi square statistic for the test if the standard deviation of the selected batteries is 6 minutes.
2. If the test is repeated with a new random sample of 6 batteries. What is the probability that the standard deviation of the new test is greater than 6 minutes?
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Ответ:
2. The reason that the new test would be greater then 6 minutes is because they are new test batteries and have not been used or ran.
Ответ:
adult $8.00
child $5.50
Step-by-step explanation:
Let the price of 1 adult ticket = x.
Let the price of 1 child ticket = y.
2x + 4y = 38
3x + 3y = 40.5
Multiply the first equation by 3. Multiply the second equation by -2. Then add them.
6x + 12y = 114
(+) -6x - 6y = -81
6y = 33
y = 33/6
y = 5.5
2x + 4y = 38
2x + 4(5.5) = 38
2x + 22 = 38
2x = 16
x = 8
adult $8.00
child $5.50