Boris bought 5 CDs that were each the same price. Including sales tax, he paid a total of $59.50. Each CD had a tax of $0.70. wh
2 answers:
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Answer:
Step-by-step explanation:
For this case we have the following expression:
For this case we can apply the following property:
And we can rewrite the following expression like this:
And we can rewrite like this our expression:
Now we can use the following property:
And we got this:
And now we can apply the following property:
And we got this:
And that would be our final answer on this case.
Answer:
They should warranty the product for 7 years if they want no more than 6.7% of the waffle irons to fail within that time.
Step-by-step explanation:
Normal Probability Distribution:
Problems of normal distributions can be solved using the z-score formula.
In a set with mean and standard deviation
, the z-score of a measure X is given by:
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.
The average waffle iron lasts for 12 years and one standard deviation is 8 months.
Measuring the time in months, we have that and
How long should they warranty the product for if they want no more than 6.7% of the waffle irons to fail within that time?
This is X when Z has a p-value of 0.067, so X when Z = -1.5. Then
84 months = 7 years.
They should warranty the product for 7 years if they want no more than 6.7% of the waffle irons to fail within that time.