Solution :
Given that,
mean = = 80000
standard deviation = = 6000
P (62000 < x < 98000 )
P ( 62000 - 80000 / 6000) < ( x - / ) < ( 98000- 80000 / 6000)
P ( - 18000 / 6000 < z < - 7 / 6000 )
P (-3 < z < 3 )
P ( z < 3 ) - P ( z < -3 )
Using z table
=0.9987- 0.0013
= 0.9974
Probability = 0.9974
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