1. What is the probability that HIV-infected adults in 2017 have a First CD4 Count between 200 and 300?Mean=243 SD=65

Is the answer 1.54 0r 154% using the following working :

P : z < 300-2430 =0.88

65

P: Z < 200-243 = -0.66

65

P: 200

OR is this one the correct way of working

Z=200-243/65

= -0.66

P=.2546 of everything below z

1-.25=0.75

Z=300-243/65

=0.8769

P=.8078of everything below z

1-.8078=0.19

P= 0.75-0.19=0.56 or 56%