Question

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

Answer 1

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

Answer 2

I used that and the answers are incorrect

Answer 3

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

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