Given that,
mean = = 10000
standard deviation = =500
Using standard normal table,
P(Z > z) = 65.54%
= 1 - P(Z < z) = 0.6554
= P(Z < z ) = 1 - 0. 6554
= P(Z < z ) = 0.3446
= P(Z < -0.40) = 0.3446
z = -0.40 (using standard normal (Z) table )
Using z-score formula
x = z * +
x= -0.40*500+10000
x= 9800
Prob-5 The lighting department of a city has installed 2000 electric lamps with an average life...
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