document.write( "Question 445391: In one region, the september energy consumption levels for a single-family homes are found to be nomrally distributed with a mean of 1030kWh and a standard deviation of 22kWh. Find the probability that for 16 randomly selected homes, the average energy consumption in September is less than 1021kWh.
\n" ); document.write( "A) 0.0505 B)03.409 C)0.6591 D)0.9495
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Algebra.Com's Answer #306827 by ewatrrr(24785)\"\" \"About 
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\n" ); document.write( "Hi
\n" ); document.write( "september energy consumption levels for a single-family homes are found to be normally distributed
\n" ); document.write( "\"mu\" of 1030kwph and a \"sigma\"of 22kwh
\n" ); document.write( "probability that for 16 randomly selected homes,
\n" ); document.write( "the average energy consumption in September is less than 1021kWh
\n" ); document.write( " *Note: \"z+=+%28x+-+mu%29%2F%28%28sigma%29%2Fsqrt%28n%29%29\"
\n" ); document.write( " z = \"+%281021-1030%29%2F%2822%2F4%29+=+-9%2F%2822%2F4%29+=+-9%2F5.5+=+-1.6364\"
\n" ); document.write( " P( z < -1.6364) = .0509 NORMSDIST(-1.6364)per Excel\r
\n" ); document.write( "\n" ); document.write( "Point being not much probability of that happening
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