Answer the following questions about probability and statistics. A. Given that Z ~ Normal(0, 1), then what is the equivalent of P(-Za/2

Answer the following questions about probability and statistics.

Extracted text: Answer the following questions about probability and statistics. A. Given that Z ~ Normal(0, 1), then what is the equivalent of P(-Za/2 < z="">< za/2)?="" b.="" if="" y="" is="" a="" normally="" distributed="" variable="" where="" u="18" and="" o="2.5," then="" what="" is="" the="" value="" of="" ß="" that="" satisfies="" p(y="">< b)="">