Solve the logarithmic equation. Be sure to reject any value that is not in the domain of the original logarithmic expression. Gi
ve the exact answer.
1 answer:
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Answer:
Step-by-step explanation:
Cost of one cup of coffee=$2
The original amount of money on the gift card= $30
Juan's expenses in buying coffee, after morning are
.
The amount of money left, , on the card
(Original amount)
(Total expenses)
Hence, the equation for, , the amount of money remaining on the card is
We are given the following data:
Sample Size = n = 1000
Sample Mean = u = 15 hours
Population Standard Deviation = s = 2 hours
Since we know the population standard deviation, we can use z distribution to find the confidence interval about the mean. z value for 95% confidence interval is 1.96.
Formula for the confidence interval is:
Using the values in the formula, we get:
Therefore, the 95% confidence interval about the population mean is 14.88 hours to 15.12 hours. So B option is the correct answer.