Question

# Suppose that the battery life on the New Smart Phone is approximately normally distributed with mean...

Suppose that the battery life on the New Smart Phone is approximately normally distributed with mean 5.6 hours and standard deviation 0.62 hour.

What is the probability that a fully charged New Smart Phone will last less than 5.02 hours?

My options are-

.2134

-.216

.1748

.8252

Solution :

Given that ,

mean = = 5.6

standard deviation = = 0.62

P(x < 5.02 ) = P[(x - ) / < (5.02 - 5.6) / 0.62 ]

= P(z < -0.9355 )

= 0.1748 , Probability = 0.1748

Option 3rd is correct.

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