Question 912513
 m = 5600,  sd = 3200
{{{z =blue (x - mu)/blue(sigma/sqrt(n))}}}
a) P(4000 < x < 6000) = normalcdf(4000,6000,5600,320) Using TI
0r 
P(4000 < x < 6000) = P( z < 400/320) - P(z < -1400/320)
b)P(x < 5000) = P(z < 600/320)
compute z, use table etc to find Probability