Question
In: Math
The lifetime of light bulb is normally distributed with mean of 1400 hours and standard deviation of 200 hours.
The lifetime of light bulb is normally distributed with mean of 1400 hours and standard deviation of 200 hours.
a. What is the probability that a randomly chosen light bulb will last for more than 1800 hours?
b. What percentage of bulbs last between 1350 and 1550 hours?
c. What percentage of bulbs last less than 1.5 standard deviations below the mean lifetime or longer than 1.5 standard deviations above the mean?
d. Find a value k such that 20% of the bulbs last longer than k hours.
Solutions
milcah answered 2 years agoRelated Solutions
2. The lifetime of light bulb is normally distributed with mean of 1400 hours and standard...
2. The lifetime of light bulb is normally distributed with mean
of 1400 hours and standard deviation of 200 hours.
a. What is the probability that a randomly chosen light bulb
will last for more than 1800 hours?
b. What percentage of bulbs last between 1350 and 1550
hours?
c. What percentage of bulbs last less than 1.5 standard
deviations below the mean lifetime or longer than 1.5 standard
deviations above the mean?
d. Find a value k such that...
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