PDA

View Full Version : Stats guys: Help!



SilentJay
12-10-2010, 04:14 PM
I've been staring furiously at this question, and just can't seem to figure it out. Can anyone chime in please? Brain is turning into mush...



Use Excel’s NORMINV function to answer the following questions:

Quarters have weights that are normally distributed with a mean of 5.67g and a standard deviation of 0.64g. A vending machine is designed only to accept quarters with weights in the middle 95% (rejecting quarters with weights in the top or bottom 2.5%). (Round all answers to 2 decimal places).

4. Find the minimum weight for a quarter to be accepted.
5. Find the maximum weight for a quarter to be accepted.

m_bisson
12-10-2010, 06:51 PM
rofl. Stats!!!!! I did that last year. so the minimum weight of the quarter would be 5.03 and the max 6.31? And then you want the middle 95% of that range? Or do I remember less about stats than I thought.....