# Probabilities - Bell Telephone

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The Bell telephone co. surveyed an apartment building with 500 units to find out who subscribes to their service. Turns out 70% of the units use Bell's service.

Find the probability that less than 340 units are using Bell services so we are looking for:

P(X<340)

Z= 340-350/10.25=-0.98

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##### Solution Summary

The solution addresses the Bell telephone co. surveyed an apartment building with 500 units to find out who subscribes to their service. Turns out 70% of the units use Bell's service.

##### Solution Preview

From the example, we know that X~(350,10.25^2)

we transfer it into Z= 340-350/10.25=-0.9756

Therefore the ...

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