two questions need help clarifying

[marbs]

1. Calculate the standard deviation

Mean = 38.4
Z score = 0.95
X value = 42.2

I got standard deviation of 4... Is that right?

2. A 68, 95, 99.7% question

Alright, so we had a list of measurements for animals at a zoo. We had to choose a particular zoo. There were 45 animals.

We had to calculate its 68% I got something (forgotten)

We then had to calculate the values in there. I counted all values between 1 standard deviation point either way.

I counted 29.     29/45 = 64%

The question - Determine whether this equation would fit in a normal distribution?  :idiot2:

I said it would because it was close enough to 68%....? Is this right... what would you have said.

Thanks.

[marbs]

anyone... I need it for tomorrow....

[Mao]

1) 4 is correct

2) cannot understand you.

[marbs]

haha thanks. I know as I was type it was hard to understand.

I'l try one last time...

• They asked to calculate the amount of x values in the 68% region
  I calculated that 64% of the values were in there (might have made an error)
  They asked 'From this knowledge would it be considered a normal curve'
  I said yes

I'm remembering from the top of my head so it might still be confusing sorry

[Mao]

quite clearly this is related to a SAC

but I really aren't helping you at all

your reasoning does appear correct, but that's only from the info given. I'm afraid I cannot comment any further

[bigtick]

You need to check +/- 2 sd and 3 sd for 95% and 99.7%. The last one is considered as 100%.

[marbs]

cheers its all good now.

I found it on wiki lol, an unlikely source I would have thought