Suppose that 3< a< 4 and 4< b< 5. find all possible values of:

a-b

If 4 < b < 5, then -4 > -b > -5, or -5 < -b < -4.

Then

3 < a < 4  ==>  3 - 5 < a - b < 4 - 4  ==>  -2 < a - b < 0

30 people weigh 160 pounds or more

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;