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Probabilities - Bell Telephone

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

Solution Preview

From the example, we know that X~(350,10.25^2)
<br>we transfer it into Z= 340-350/10.25=-0.9756
<br>Therefore the ...

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.

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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