<h2>
Answer with explanation:</h2>
Consider a sampling distribution with p equals 0.12 and samples of size n each.
Then, formula for mean = p
Formula for standard deviation= 
(a) For a random sample of size n equals 5000.
Mean = 0.12
Standard deviation= 

(b) For a random sample of size n equals 1000.
Mean = 0.12
Standard deviation= 

(c) For a random sample of size n equals 500.
Mean = 0.12
Standard deviation= 

Answer: The refrigerator cost in this month is $4.5 approximately.
Step-by-step explanation:
Since we have given that
Amount of watt of electric power = 320 W
Number of days = 30
Unit cost of electricity = $0.13/Kwh
Hold factor = 
Number of hours in a month = 24
So, the refrigerator cost in this month would be

Hence, the refrigerator cost in this month is $4.5 approximately.
Answer: The solution to this is <u><em>y=10x-4</em></u>
Step-by-step explanation:
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