A digital video recorder (DVR) records television shows on an internal hard drive. To use a DVR, you need a subscription with a
DVR service company. Two companies advertise their charges for a DVR machine and subscription service.
For what number of months will consumer pay less for the machine and subscription at easy electronics than at cable solutions
The consumer will pay less for the machine and a subscription at easy electronics then I have cable solutions if the customer uses .......... months or more
Will give brainliest
For what number of months will consumer pay less for the machine and subscription at easy electronics than at cable solutions
The consumer will pay less for the machine and a subscription at easy electronics then I have cable solutions if the customer uses .......... months or more
Will give brainliest
1 answer:
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Answer:
A. 0.009899
B. 0.005624
Step-by-step explanation:
Data:
Let the probability that an item is defective =
The probability that the item is not defective =
The probability that the fifth item is defective =
= 0.009899
Probability that one in 5 items is defective = 0.005624
Answer:
a)
b) Lower endpoint: 0.422cc/m³
Upper endpoint: 0.452 cc/m³
Step-by-step explanation:
Population is approximately normal, so we can find the normal confidence interval.
We have that to find our level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of .
So it is z with a pvalue of , so
. This is the critical value, the answer for a).
Now, find M as such
In which is the standard deviation of the population and n is the size of the sample.
The lower end of the interval is the sample mean subtracted by M. So it is 0.437 - 0.015 = 0.422cc/m³.
The upper end of the interval is the sample mean added to M. So it is 0.437 + 0.015 = 0.452 cc/m³.
b)
Lower endpoint: 0.422cc/m³
Upper endpoint: 0.452 cc/m³