two exercises about normal random variable

I

inverse

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May 17, 2012
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Can you help me with these exercises?

A) A florist delivery transports boxes loaded with flowers. If the weight of each box may be considered as a random variable with mean standard deviation 50 kg and 5 kg, how many boxes can be transported by the truck so that the probability of exceeding the total load of 1 tonne is only 0.01?

B)The distribution of grades earned by employees of a company to measure job performance is a normal variable with mean 70 and standard deviation 7.What is the probability that the difference between the scores of two workers (chosen at random) is between +5 and -5?


Thank you very much for your help and atenttion :)
 
inverse said:
Can you help me with these exercises?

A) A florist delivery transports boxes loaded with flowers. If the weight of each box may be considered as a random variable with mean standard deviation 50 kg and 5 kg, how many boxes can be transported by the truck so that the probability of exceeding the total load of 1 tonne is only 0.01?

B)The distribution of grades earned by employees of a company to measure job performance is a normal variable with mean 70 and standard deviation 7.What is the probability that the difference between the scores of two workers (chosen at random) is between +5 and -5?


Thank you very much for your help and atenttion :)
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