Answer:
Step-by-step explanation:
We need to use the properties shown below to solve this:
1.
2.
3.
Area of a triangle is given by 1/2 * base * height, so we do that and simplify:
Answer:
3’5”
Step-by-step explanation:
14/4
Answer:
Step-by-step explanation:
The confidence interval for population mean is given by :-
Given : Sample mean : hours
Standard deviation hours
Sample size : n=90, which is a large sample(n<30), so we use z-test.
Significance level:
Critical value :
Then , the confidence interval for population mean will be :-
Hence, the 90% confidence interval for the mean life of all light bulbs of this type. is
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