The monthly income of 5,000 workers at the URC plant are distributed normally. Suppose the mean monthly income is 10,250 pesos and the standard deviation is 250. a) 20% of workers earn more than how much per month? sketch the curve: solution: b) How many workers earn less than 8500 pesos per month? sketch the curve: solution: c) What percentage of the workers earn between 8500 pesos and 12,000 pesos per month? sketch the curve: solution: d) 95% of workers earn less than how much per month? sketch the curve: solution: e) The middle 50% of workers earn between how much? sketch the curve: solution:
The monthly income of 5,000 workers at the URC plant are distributed normally. Suppose the mean monthly income is 10,250 pesos and the standard deviation is 250. a) 20% of workers earn more than how much per month? sketch the curve: solution: b) How many workers earn less than 8500 pesos per month? sketch the curve: solution: c) What percentage of the workers earn between 8500 pesos and 12,000 pesos per month? sketch the curve: solution: d) 95% of workers earn less than how much per month? sketch the curve: solution: e) The middle 50% of workers earn between how much? sketch the curve: solution:
The monthly income of 5,000 workers at the URC plant are distributed normally. Suppose the mean monthly income is 10,250 pesos and the standard deviation is 250. a) 20% of workers earn more than how much per month? sketch the curve: solution: b) How many workers earn less than 8500 pesos per month? sketch the curve: solution: c) What percentage of the workers earn between 8500 pesos and 12,000 pesos per month? sketch the curve: solution: d) 95% of workers earn less than how much per month? sketch the curve: solution: e) The middle 50% of workers earn between how much? sketch the curve: solution:
3. The monthly income of 5,000 workers at the URC plant are distributed normally. Suppose the mean monthly income is 10,250 pesos and the standard deviation is 250. a) 20% of workers earn more than how much per month? sketch the curve: solution: b) How many workers earn less than 8500 pesos per month? sketch the curve: solution: c) What percentage of the workers earn between 8500 pesos and 12,000 pesos per month? sketch the curve: solution: d) 95% of workers earn less than how much per month? sketch the curve: solution:
e) The middle 50% of workers earn between how much? sketch the curve: solution:
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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