Jean and mark are going to fill a pool with 2 different sized hoses. jean can fill the pool in 8 hours, while mark can complete it in 12 hours. their supervisor thinks that the job will take 10 hours to complete if they work together. explain each step in solving this equation, and determine if the supervisor is correct or not. (10 points)

good luck on your studies! : )

david edward.

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;