Answer:
d. 4.6 years
Step-by-step explanation:
Problems of normally distributed samples can be solved using the z-score formula.
In a set with mean and standard deviation
, the zscore 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 pvalue, we get the probability that the value of the measure is greater than X.
In this problem, we have that:
What warranty should be provided so that the company is replacing at most 10% of their toasters sold?
Only those on the 10th percentile or lower will be replaced.
So the warranty is the value of X when Z has a pvalue of 0.10.
So it is X when
So the correct answer is:
d. 4.6 years