Suppose that the grades of Mathematics module is modeled well by a normal probability distribution with mean (220) and standard deviation XXXXXXXXXXLet X be the random variable representing this...

Suppose that the grades of Mathematics module is modeled well by a normal probability distribution with mean (220) and standard deviation (130). Let X be the random variable representing this distribution. Find two symmetric values “a” and “b” such that

Probability [ a < x="">< b="" ]="0.99" ,="" where="" a="">