Math Is Fun Forum

Sorry it's supposed to be 451 g. and the other number is :
no more than 453 g
my error

I will post a problem in a new topic. I have been getting a few right this morning, so there is light at the end of the road. haha

Hello, and good morning. I don't remember since i typed it in and it was correct last night. The table was very helpful, if I can read it accurately.
How do I differentiate between below the mean and below it. I know to the left is negative and right positive.

I am working on more math. So many things to ask. I have a quiz on this stuff than another test online.

So this is a bit of Trig. and Algebra combined or what is it? And the chart is great, but how do i find my way around it, mean, stand. dev., percentage. etc? I don't mean to sound stupid.

z = -1.6 and z = - 0.8 is ____%.
How do you do this? Can u explain it for me. Thanks.

I don't know why but it's not taking that answer. The online homework site is picky about how it wants the answer.
It just said to round to the nearest integar.

yes. Can this one be solved from the graph you posted yesterday?
Find the per cent of the total area under the standard normal curve between the following z-scores.

z= -1.4 and z = -0.65
The per cent of the total area between z= -1.4 and z = -.65 is _____%.
Thanks.

I didn't know how to use the graph you posted, so I just kept plugging away with the calculator. Thanks so much.

The first one, .4  i think it was .0155, later i had a problem with .8 that was 29%.

The answer was 29%. I still don't understand it. I get half the problem right and there at the last part do something wrong.

Okay, I reworked that one and understand it better; I think. Both sides are being multiplied then divided by five.

It's the correct answer for sure.

Truthfully, i don't know if i understand it or not. I am going to post more problems. I wish I had found this forum last semester when I had Algebra. It's a wonderful forum with genius mathematicians.