The lifespan of brand A batteries is Normally distributed with a mean of 108 hours and a standard deviation of 12.5 hours. The lifespan of brand B batteries is Normally distributed with a mean of 92 hours and a standard deviation of

15.1 hours. A quality control specialist selects a random sample of 25 of each type of battery and calculates the

sample mean lifespan for each brand. Let 5, -ē, be the difference in the sample mean lifespan for each brand of

battery. What is the mean of the sampling distribution of the difference in sample means?

Do not round your answer.

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step-by-step explanation:

step-by-step explanation:

if you want to solve percent error follow these steps.

1. subtract the accepted value from the experimental value.

2. take the absolute value of step 1.

3. divide that answer by the accepted value.

4. multiply that answer by 100 and add the % symbol to express the answer as a percentage.

if you want to solve percent of change just do this.

1. work out the difference (increase) between the two numbers you are comparing.

2. divide the increase by the original number and multiply the answer by 100. if your answer is a negative number then this is a percentage decrease.

hope this : )