D=c-s/n solve for n for a project that's got me all sorts of confused

The given expression is

And we have to solve for N.

TO solve for N, first we do cross multiplication, that is

And to solve for N, we have to divide both sides by D, that is

And that's the required value of N .

answer: 193

explanation:

200-7 = 193

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;