For standard deviation determine following possibilities

a) P(z > 1.28) =| (Round to four decimal places as needed.) b) P(z> -0.54) = (Round to four decimal places as needed.) c) P( - 1.57 szs - 0.80) = (Round to four decimal places as needed.) d) P( - 1.56 s z s 0.20) = (Round to four decimal places as needed.)