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September 17th, 2009, 01:55 PM
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| |  elevator weight question! urgent help !
normal distribution... the max elevator weight cannot be greater than 1120kg or 16 people. suppose that the weights of lift users are normally distributed with a mean of 68kg and a standard deviation with 8kg.
what is the probability that 16 people will exceed the weight limit of 1120kg?
and also what is the probability that 18 people will not exceed the weight limit?
p.s thank you for your help |
September 18th, 2009, 07:05 AM
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Quote:
Originally Posted by tofustar  normal distribution... the max elevator weight cannot be greater than 1120kg or 16 people. suppose that the weights of lift users are normally distributed with a mean of 68kg and a standard deviation with 8kg.
what is the probability that 16 people will exceed the weight limit of 1120kg?
and also what is the probability that 18 people will not exceed the weight limit?
p.s thank you for your help | Weight of 16 people: X ~ Normal  .
Calculate  .
Weight of 18 people: Y ~ Normal  .
Calculate  .
__________________ There are two things you should never try to prove: the impossible and the obvious. The greater danger for most of us lies not in setting our aim too high and falling short; but in setting our aim too low and achieving our mark. (Michelangelo Buonarroti)
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September 18th, 2009, 09:12 AM
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Quote:
Originally Posted by mr fantastic Weight of 16 people: X ~ Normal .
Calculate . | 
or  Quote:
Weight of 18 people: Y ~ Normal .
Calculate .
| same again but with 18 in place of 16.
CB
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Last edited by CaptainBlack; September 18th, 2009 at 09:50 AM.
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September 18th, 2009, 10:24 AM
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Quote:
Originally Posted by CaptainBlack
or
same again but with 18 in place of 16.
CB | Thanks for that catch. Careless of me. (Perhaps my evil nature asserting itself).
@OP: 
__________________ There are two things you should never try to prove: the impossible and the obvious. The greater danger for most of us lies not in setting our aim too high and falling short; but in setting our aim too low and achieving our mark. (Michelangelo Buonarroti)
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Last edited by mr fantastic; September 18th, 2009 at 10:39 AM.
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