Question 477770
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Hi,
&#956; = 106  
&#963; = 8
A) z = -8/8 = 1  and z = 16/8 = 2  
P(-1 > z < 2) =  .9883    - .1587 = .8186 or 81.86%
              NORMSDIST(2)  NORMSDIST(-1)

B) 97.5 percentile  P = .975 the z = 1.96
  1.96 *8 + 106 =  = 121.68 or rounded up 122mm Hg
 97.5 % of the people have a systolic blood pressure less than 122