2. Variation on #17.] The formula for the standard normal distribution is 27T (a) Represent this expression using a binary tree where-1, 1, 2, 2, 2, ?, e, and r are the leaves. In the internal vertex labels, use *for multiplication, / for division, and ** for the exponent operator.|5 points] (b) Using the binary tree, rewrite the expression in prefix notation. [5 points c) Using the binary tree, rewrite the expression in postfix notation. 5 points (d) Using the binary tree, rewrite the expression in infix notation.5 points Answer only; no explanation needed. Answer only; no explanation needed. Answer only; no explanation needed. Answer only; no explanation needed