An important factor in solid missile fuel is the particle size distribution. significant problems occur if the particle sizes are too large. from past production data, it has been determined that the particle size (in µm, i. e., micrometers) distribution is characterized by f(x) =(3x−4, x > 1 0, elsewhere.
(a) find the mean particle size.
(b) find the variance and standard deviation of the particle size.