The time of lasting of a particular brand of light bulb is normally distributed with mean 400 hours and standard deviation of 20 hours. What is the probability of the bulbs will last at least 440 hours?
Contingency Table
A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.
Binomial Distribution
Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.
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Let X denote the time of lasting of light bulb. Given that X follows N(mean = 400, SD = 20), then
Z = (X - mean)/SD follows N(0,1)
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