1. what was it 4 h 30 min before 9:50 am?
2. tennis instruction at camp Cherokee is for 45 minutes a day 4 days a week. how many hour a week is this?
3. a plane flies from phoenix to Memphis in 3 hours and 20 minutes. it left phoenix at 2:50 pm mountain time. at what time did it arrive in Memphis (central time).

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;

answer: c. im 100 percent sure

step-by-step explanation: