Posted by **thelma** on Friday, February 18, 2011 at 11:41pm.

if a data se has a mean of 10.0 seconds & a standard deviation of 2.0 seconds, what is the z score corresponding to the time of 4.0 seconds?

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**Reiny**, Saturday, February 19, 2011 at 10:44am
z-score(4s) = (4-10)/2

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**PsyDAG**, Saturday, February 19, 2011 at 10:45am
Z = (score-mean)/SD

Insert values and calculate.

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**Mia**, Saturday, July 23, 2011 at 8:28pm
A particular statistician knows that approximately 35% of people do not tell the truth when polled. If 400 people were polled in a survey, how many would be expected to answer before someone answers untruthfully?

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