Electricity bills: According to a government energy agency, the mean monthly household electricity bill in the United States in 2011 was $109.77 . Assume the amounts are normally distributed with standard deviation $22.00 . Use Excel to answer the following. Round the answer to four decimal places. Part: 0 / 3 0 of 3 Parts Complete Part 1 of 3 (a) What proportion of bills are greater than $137 ? The proportion of bills that are greater than $137 is .
Electricity bills: According to a government energy agency, the mean monthly household electricity bill in the United States in 2011 was $109.77 . Assume the amounts are normally distributed with standard deviation $22.00 . Use Excel to answer the following. Round the answer to four decimal places. Part: 0 / 3 0 of 3 Parts Complete Part 1 of 3 (a) What proportion of bills are greater than $137 ? The proportion of bills that are greater than $137 is .
Electricity bills: According to a government energy agency, the mean monthly household electricity bill in the United States in 2011 was $109.77 . Assume the amounts are normally distributed with standard deviation $22.00 . Use Excel to answer the following. Round the answer to four decimal places. Part: 0 / 3 0 of 3 Parts Complete Part 1 of 3 (a) What proportion of bills are greater than $137 ? The proportion of bills that are greater than $137 is .
Electricity bills: According to a government energy agency, the mean monthly household electricity bill in the United States in
2011
was
$109.77
. Assume the amounts are normally distributed with standard deviation
$22.00
. Use Excel to answer the following. Round the answer to four decimal places.
Part: 0 / 3
0 of 3 Parts Complete
Part 1 of 3
(a) What proportion of bills are greater than
$137
?
The proportion of bills that are greater than
$137
is .
Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...
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