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I dont have a z-table :(

is it .2054?

now calculate P(X<1975)

How would I calculate that? P((0.9678)<1975) ? @nitishdua31

Ohhhhhhhh gotcha

coz when you subtract them , you get the probability of the bulb having life expectancy between them

0.17619
0.32381
0.79165
0.96784
that bottom answer looks like the one you gave earlier

these are the choices @nitishdua31

I'm so lost right now @nitishdua31

the third being the bottom?

yes

which represents less than 1975

I got 75

@ganeshie8 can u help ?

0.5 for the Z? @nitishdua31