The points x = 63 and x = 35 are shown in (figure 1 ). Since x = 35 is located to the left of mean x = m the corresponding value of z is negative. When x = 63, z is given by
From (figure 1 ) and (figure 2 ), we have
P ( 0 < z < z2 ) = 0.39 and P ( 0 < z < z1 ) = 0.43
From the table we have z2 = 1.23 and z1 = 1.48
\
1.23 s
+ m
= 63 Þ
(1) and -1.486 + m
= 35 Þ
(2)
on solving (1) and (2) we get m
= 50.3 and s = 10.33
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