Problems with distribution curves?

Question

I have several problems to solve in this area with limited time.

1. Find the area under the normal distribution curve to the right of z= -3.24 it could be one of four answers: 0.499 or -0.499 or 0.999 or 0.001

2. Find the area under the normal distribution curve between z= -1.34 and x= 2.95. it could be one of four answers: 0.908 or 0.088 or 0.410 or 0.498

3.The area under a normal distribution curve that lies within one standard deiviation of the mean is approximately_____.

is it: 95% or 99.7% or 68% or 65%.

4. Find the area under the normal distribution curve to the right of z = -1.03. it could be one of four answers: 0.151 or -0.349 or 0.349 or 0.849.

5. Which of the following is not a propeerty of a normal distribution? it never touches the x-axis or it is continuous or the mean, median, and mode are equal or it is bimodal (i.e. it has two modes).

Answer 1

1: Area=0.999

2: Area=0.908 (though it is between z1 and z2 not between z1 and x1)

3: 68%

4: Area=0.849

5: it is bimodal - is False (though I'm not very confident)

True - the mean, median, and mode are equal

True - it is continuous

True - it never touches the x-axis

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

http://en.wikipedia.org/wiki/Standard_de...