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September 22, 2014

September 22, 2014

Posted by **Taylor** on Saturday, February 23, 2013 at 8:39pm.

a) find the probability of selecting a 1 foot square sample of material at random that on testing would have a breaking strength in excess of 2240 psi.

b)what is the breaking strength value in psi that separates the strongest 20% of one foot square samples from the weakest 80%?

- Math Help Please!!!! -
**PsyDAG**, Sunday, February 24, 2013 at 11:38ama) Z = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.

b) Start with Z value for .20 and insert i8n equation above.

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