A light bulb has a normally distributed light output with mean 5000 end foot-candles and standard deviation of 50 end foot-candles.
a. Find a lower tolerance limit such that only 0.2% of the bulbs will not exceed this limit.
b. What fraction of these lightbulbs will have a lower than an output of 5080 end footcandles?
c. If 50000 lightbulbs are made, how many of them will have an output stronger than5080 end foot-candles?
How many of them will have an output weaker than 4890 end footcandles?