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The profits of a mobile company are normally distributed with Mean of R.O (D x 10)...

The profits of a mobile company are normally distributed with Mean of R.O (D x 10) and standard deviation of R.O (D).

a. Find the probability that a randomly selected mobile has a profit greater than R.O ((Dx10) +10).

b. Any mobile phone which profit is greater than R.O ((Dx10) +10) is defined as expensive. Find the probability that a randomly selected mobile has a profit greater than R.O ((Dx10) +20) given that it is expensive.

c. Half of expensive mobile phones have a profit greater than R.O ℎ. Find the value of ℎ.

Note: D=18

Math   Statistics-And-Probability   
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