What percentage of the kettles will last between months

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Reference no: EM13976003

The life span of an imported brand of kettles sold by an appliance giant is normally distributed with a mean of 96 months and a standard deviation of 12 months.

1. What percentage of these kettles will last between 90 and 110 months?

2. The appliance giant offers a replacement guarantee on kettles which malfunction within a certain time of the purchase, but due to financial constraints, can only afford a maximum of 5% replacements. What must the guarantee period be?

Reference no: EM13976003

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