Answer: 17.89
Step-by-step explanation:
In binomial distribution, the standard deviation is given by :-
As per given , we have
The number of vouchers in the sample with errors is denoted by x.
p= 0.20 , n = 2000
Then ,
Hence, the standard deviation of x is 17.89.
Answer:
It will take 14.29 years for your bank balance to double from $1,000 to $2,000.
Step-by-step explanation:
This is a simple interest problem.
The simple interest formula is given by:
In which E are the earnings, P is the principal(the initial amount of money), I is the interest rate(yearly, as a decimal) and t is the time.
After t years, the total amount of money is:
.
If the interest rate is 7%, how many years will it take for your bank balance to double from $1,000 to $2,000?
We have that
We want to find t when E = 1000, so .
It will take 14.29 years for your bank balance to double from $1,000 to $2,000.
