Find the probability that a vowel selected at random in the English alphabet is an "i"
2 answers:
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Answer:
3 times rebate will maximize its revenue
Step-by-step explanation:
Given that a store has been selling 300 DVD burners sold per week at 350 each
A market survey indicates that for each $ 30 rebate offered to buyers, the number of units sold will increase by 60 a week.
If x times rebate is offered then units sold would be 300+60x
Thus original revenue
After rebate of x times 30 dollars we have
New revenue
Equate first derivative to 0 to get
x=
i.e. 3 times rebate will maximize its revenue
Answer:
(1)
The confidence interval for this case would be:
And we want to know what happens with the interval if we reduce the confidence level to 90% and for this case we will get a narrower interval since the critical value would be lower. So then the best option would be:
a. becomes narrower
Step-by-step explanation:
Notation
represent the sample mean for the sample
population mean
s represent the sample standard deviation
n represent the sample size
Solution
The confidence interval for the mean is given by the following formula:
(1)
The confidence interval for this case would be:
And we want to know what happens with the interval if we reduce the confidence level to 90% and for this case we will get a narrower interval since the critical value would be lower. So then the best option would be:
a. becomes narrower