The data to the right contain the​ per-capita energy​ consumption, in​ kilowatt-hours, for each of the 20 provinces of a nation.   Complete parts​ (a) through​ (c) below.   15,628 14,954 14,051 12,803 12,051 11,978 11,264 11,175 10,689 10,193 9,806 9,649 9,615 9,167 9,100 8,847 7,449 6,722 5,457 4,122 What percentage of these provinces has average​ per-capita energy consumption within ±1 standard deviation of the mean within ±2 standard deviations of the​ mean, and within ±3 standard deviations of the​ mean? The percentage within ±1 standard deviation of the mean is __%

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The data to the right contain the​ per-capita energy​ consumption, in​ kilowatt-hours, for each of the 20 provinces of a nation.
 
Complete parts​ (a) through​ (c) below.
 
15,628 14,954 14,051 12,803 12,051
11,978 11,264 11,175 10,689 10,193
9,806 9,649 9,615 9,167 9,100
8,847 7,449 6,722 5,457 4,122
What percentage of these provinces has average​ per-capita energy consumption within ±1 standard deviation of the mean within ±2
standard deviations of the​ mean, and within ±3 standard deviations of the​ mean?

The percentage within ±1 standard deviation of the mean is __%

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