The mean income per household in a certain state is $9500 with a standard deviation of $1750. The middle 90% of incomes are between what two values

The middle 90% of incomes are between $6621.25 and $12378.75 .

Step-by-step explanation:

The critical z-value for 90% confidence = 1.645

Given: Mean income per household  =  $9500

standard deviation = $1750

then,  middle 90% of incomes are between $(9500-(1.645)(1750)) and (9500+(1.645)(1750))

i.e.  middle 90% of incomes are between $6621.25 and $12378.75.

Hence, the middle 90% of incomes are between $6621.25 and $12378.75 .

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step-by-step explanation: