Annette rode her bike 6.8 miles at a constant rate for 90 minutes. to find how fast she traveled, she solved the equation 6.8= x⋅90. what does x represent?
a)the total distance after x minutes
b)her speed in miles per minute
c)the amount of time it takes to travel 6.8 miles
d)the number of miles she has traveled so far

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;

d

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