Answer:
Option D. We are 95% confident that the mean amount spent on electric service among the 160 households is between $151 and $216.
Explanation:
A confidence interval is a range of values, derived from the sample statistics, which may include the value of an unknown population parameter.
A 95% confidence interval indicates that between 152 of 160 samples (95%) of the same population will produce confidence intervals that will contain the population parameter.
It also means that we have a 95% confidence that the average (average amount) is among the resulting amounts obtained.
Logically, option "D" is missing the final part. This would be: D. We are 95% confident that the mean amount spent on electric service among the 160 households is between $ 15.
This is the only true option, since the test is based on a sample of only 160 households, the entire population of households cannot be included.
Hence, the correct option is:
Option D. We are 95% confident that the mean amount spent on electric service among the 160 households is between $151 and $216.
Answer:
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Answer: $112.08
Explanation:
Given that,
Life insurance policy = $240,000
Cost = $210
Amount to be paid by company to old lady if she survives (A):
= $240,000 - $210
= $239,790
Probability that she survives (P1) = 0.999592
Probability that she doesn't survives (P2) = 1 - 0.999592
= 0.000408
Expected value of this policy for the insurance company:
= (P1 × cost of policy) - (P2 × A)
= 0.999592 × $210 - 0.000408 × $239,790
= $209.91432 - $97.83432
= $112.08
An annual rate of return is the amount of loss or gain made through an investment in a yaear based on the percentage of intial investment.
In this case, since the quarterly divident is $1, in one year it would be:
$1 x 4 = $4
So, the annual rate of return would be $4 / $80 x 100% = 2%
Answer:
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