My Math Forum statistics problem on normal distribution?

 November 10th, 2011, 02:27 PM #1 Newbie   Joined: Nov 2011 Posts: 2 Thanks: 0 statistics problem on normal distribution? a video rental chain estimates that annual expenditure on rentals is normally distributed with mean of $100. 10% of members spend more than$130 in a year. what % of members spend more than \$140 in a year? i have an exam tomorrow.... any help would be appreciated! i'm stuck on the first problem

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