probability and statistic

In an inequality a>=b the variables a and b are replaced by randomly selected single-digit natural numbers. Find the probability that the resulting inequality is correct.

Find confidence interval

A certain union wants to estimate the mean hourly wage μ of its members. A random sample of 15 members yields a mean equal to 6.5 dollars an a sample standard deviation equal to 0.9 dollars.... more

Strange determinant inequation

A is an all-one, 3 by 3 matrix. Prove det(C+ xA) det(C-xA) <=(less or equal) (det C)2 , for any C 3 by 3 matrix and x any real number.

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