C
The graph has a y intercept of positive 2
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
2.25 as a fraction is 2 1/4
Answer: 6
Step-by-step explanation:
12 x 12 = 144
3 x 8 = 24
144 divide by 24