Math

The graph illustrates a normal distribution for the prices paid for a particular model of HD television. The price paid is 1600 and the standard deviation is 55

What is the approximate percentage of buyers who paid more than 1710 ?

I got 2.28 and it is wrong

What is the approximate percentage of buyers who paid more than $1763?

I got 0.1% it is wrong

What is the approximate percentage of buyers who paid between $1600 and $1710?

I got 47.7% it is wrong

What is the approximate percentage of buyers who paid between $1600 and $1765

I got 49.87% and it is correct

What is the approximate percentage of buyers who paid between $1600 and $1665

I got 34.1% And it’s wrong

What is the approximate percentage of buyers who paid between $1545 and $1655

I got 68.2% And it is wrong

Please help I don’t know how it is wrong

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  1. http://davidmlane.com/hyperstat/z_table.html

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    Damon
  2. I used that and the answers are incorrect

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  3. What is the approximate percentage of buyers who paid more than 1710 ?

    I got 2.28 and it is wrong
    --------------------------------------------------------
    I put in mean = 1600
    sigma = 55
    more than 1710
    click on recalulate
    .0152 or 1.52 percent

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    Damon

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