Question

The random variable X is normally distributed with mean 45 and standard deviation a.Given that P(X>51)=0.288, find the value of a.
http://davidmlane.com/hyperstat/z_table.html
x=(z-u)/sigma
then use the z table.
But remember the z table reads "less than" so you need to do 1 - that value found on the z table : )

Related Questions

Random variables X and Y are both normally distributed with mean 100 and standard deviation 4. It i... X is a normally distributed random variable with a mean of 8.00. If the probability that X is less... A random variable is normally distributed with a mean of 50 and a standard deviation of 5. b. Wha... If a random variable X is normally distributed with mean μ and standard deviation σ, we use the nota...