(5^-2)= (1/5^2)... (1/25) now cube that so it will be 1/15625. Hope that helps
The answer is B. That is not a valid way to sample as it is not randomly selected.
Answer:
What are the choices?
Step-by-step explanation:
Answer:
[(1/12)(5/5) + (1/20)(3/3)](x hours) = 1
(5/60 + 3/60)x = 1
(8/60)x = 1 we can reduce 8/60 by dividing out a 4
(2/15)x = 1 x both sides by 15/2
x = 15/2
x = 7 1/2 or 7.5 hours
