Hi

september energy consumption levels for a single-family homes are found to be normally distributed

 of 1030kwph and a of 22kwh

probability that for 16 randomly selected homes, 

the average energy consumption in September is less than 1021kWh

  *Note: 

    z = 

   P( z < -1.6364) = .0509        NORMSDIST(-1.6364)per Excel



Point being not much probability of that happening

 

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