Answer:
she needs to sell at least 44 cookies to make a $0.10 profit
Step-by-step explanation:
to find the answer all you have to do is divide 15.30 by 0.35
Answer:
An employee would have to work 20 years in order to receive an annual pay of $45,000
Answer:
Probably unequal ( B )
Step-by-step explanation:
<u>experimental group = 10</u>
using 85% ethanol gasoline
mean = 240 pounds per 100 miles
standard deviation = 20 pounds
<u>control group = 14 vehicles </u>
using regular gasoline
mean = 252 pounds per 100 miles
standard deviation = 15 pounds
comparing the sample variance of each group shows that they are probably unequal using the equation below
Variance for a sample set of data = ∑ ( x - X ) ^2 / n - 1
where n = number of events
X = mean value
x = value of events