First take 5.6 percent of 3000. Which is 5.6/100×3000= 168.
336 divided by 168 is 2.
The final answer is 2 years
Answer: a) critical value = 0.0853, b) we reject the null hypothesis.
Step-by-step explanation:
Since we have given that
z = -1.37
And the hypothesis are given below:

Since α = 0.01
since critical value = 0.0853
As we can see that 0.853 < 0.25.
so, we reject the null hypothesis.
Hence, a) critical value = 0.0853, b) we reject the null hypothesis.
I think its B not sure tho sorry
The quotient of 2 times some number and four.
Hope this helps and sorry if it is wrong but it’s what I got