The 80% confidence interval for the population standard deviation is 7.7 interval if we changed the confidence level to 90%?
Select one:
A. (7.9, 13.1)
B. (8.2, 12.1)
C. (6.85, 14.77)

the answer would be 484

step-by-step explanation:

just multiply 0.484 times 1,000 (formula)

step-by-step explanation:

let's assume

number of candles set =x

price of of x candles =p(x)

we are given

a candle maker prices one set of scented candles at $10 and sells an average of 200 sets each week

so, we get point as (200,10)

he finds that when he reduces the price by $1, he then sells 50 more candle sets each week

so, we can find slope

now, we can use point slope form of line

now, we can plug values

we can use point

and find b

now, we can plug it back

and we get

now, we can find revenue

we know that

revenue = price*quantity

so, we get