The number of days, d, required to complete a job varies inversely as the number of workers, w, on the job. If it takes 9 days for 8 workers to complete a job, then how many workers would it take to do the job in 18 days?

4

Step-by-step explanation:

this one is an easy relationship- if you have double the time (18 vs9), then you need half the workers (8/2)

right

step-by-step explanation:

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;