Answer:
A
Step-by-step explanation:
20 times 10% is 2
Answer:
need the equation
Step-by-step explanation:
Find the area of the gym and divide that by the required space.
Area of gym: 300 x 300 = 90,000 square feet.
Number of people: 90,000 / 4 = 22,500
They can sell 22,500 tickets.
Answer:
We need at least 217 compact fluorescent light bulbs
Step-by-step explanation:
We have that to find our
level, that is the subtraction of 1 by the confidence interval divided by 2. So:

Now, we have to find z in the Ztable as such z has a pvalue of
.
So it is z with a pvalue of
, so 
Now, find M as such

In which
is the standard deviation of the population and n is the size of the sample.
How many compact fluorescent light bulbs need to be selected?
We need at least n bulbs, in which n is found when 
So







We need at least 217 compact fluorescent light bulbs