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
Lets make it an improper fraction
5/3
we do not know how many chains so we'll put the (x)
therefore
5/3x=9.00
x= 5.4
Answer:
The difference is subtracting 6.5
19.5, 25, 31.5
Step-by-step explanation:
Answer:
About 6 chairs
Step-by-step explanation:
75x=22.50+420
75x=442.5
x=5.9
So about 6 chairs
Out of 45 times at bat, Raul got 19 hits. Find Rauls batting average as a decimal rounded tothe nearst thousandth.