Mathematics (AS & A Level) · Oct / Nov 2018 · Paper 63 · Question 6
9709
As printed in the paper
The question as text
The lifetimes, in hours, of a particular type of light bulb are normally distributed with mean 2000 hours and standard deviation 3 hours. The probability that a randomly chosen light bulb of this type has a lifetime of more than 1800 hours is 0.96.
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6(i)[3]
6(ii)[4]
6(iii)[1]
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