CityPopulation"Fire/EMS spending per resident""Fire/EMS personnel per 1000 residents"# of fire personnelBoston608,352$452.153.42068San Francisco799,183$315.812.21758Columbus, OH747,755$255.702.11570Seattle594,210$247.751.81070Baltimore637,455$225.982.71721Memphis674,028$220.222.51685Detroit916,952$201.541.61467Nashville590,807$194.431.91123Philadelphia1,449,634$187.631.62319Jacksonville805,605$179.991.51208New York8,274,527$157.561.714067Los Angeles3,834,340$137.800.93451calculate the average mean earnings of fire/ems personnel in each of the 12 cities.

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City	Population	"Fire/EMS spending per resident"	"Fire/EMS personnel per 1000 residents"	# of fire personnel
Boston	608,352	$452.15	3.4	2068
San Francisco	799,183	$315.81	2.2	1758
Columbus, OH	747,755	$255.70	2.1	1570
Seattle	594,210	$247.75	1.8	1070
Baltimore	637,455	$225.98	2.7	1721
Memphis	674,028	$220.22	2.5	1685
Detroit	916,952	$201.54	1.6	1467
Nashville	590,807	$194.43	1.9	1123
Philadelphia	1,449,634	$187.63	1.6	2319
Jacksonville	805,605	$179.99	1.5	1208
New York	8,274,527	$157.56	1.7	14067
Los Angeles	3,834,340	$137.80	0.9	3451

calculate the average mean earnings of fire/ems personnel in each of the 12 cities.

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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City Population "Fire/EMS spending per resident" "Fire/EMS personnel per 1000 residents" # of fire personnel Boston 608,352 $452.15 3.4 2068 San Francisco 799,183 $315.81 2.2 1758 Columbus, OH 747,755 $255.70 2.1 1570 Seattle 594,210 $247.75