Homework Help: math

Posted by ghb on Thursday, March 1, 2012 at 11:12am.

the probability taht an imdividual is left-handed is 0.30 in a class of 25 students, what is the the mean and standard deviation of the number of left-handers in the class

math - MathGuru, Friday, March 2, 2012 at 6:17pm
Mean = np = 25 * .3 = ?
Standard deviation = √npq = √(25)(.3)(.7) = ?
Note: q = 1 - p

I'll let you finish the calculations.

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