When the new computer lab opened thete were 18 computers by the end of the first week there were 25 computers fi d the percent of change in the number of computers?

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- Use this equation:

(difference/original) x 100

Substitute the values in:

(7/18) x 100

Solve:

Percentage change = 38.888888889

You may write this as  38.89%

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d. 24+-0.114

step-by-step explanation:

the question requires us to calculate the approximate 95% confidence interval for the mean number of ounces of ketchup per bottle in the sample given the following statistics;

sample mean = 24

standard deviation, σ = 0.4

sample size , n = 49

the confidence interval for a population mean is calculated using the formula;

sample mean ± z-score*(σ/sqrt(n))

the z-score associated with a 95% confidence interval, from the standard normal tables, is;

1.96

substituting these values into the formula;

24 ± 1.96*(0.4/7)

= 24 ± 0.112

from the alternatives given, choice d is closest to the above expression;