Activity: Eight persons enter a supermarket. From past experience, it is known that 25% of the people entering the supermarket make a purchase. Let X be the number of customers who will make a purchase. 1. What are the possible values of the random variable X? 2. Construct the probability distribution of X. X P(X=x) 3. What is the probability that
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.
Activity:
Eight persons enter a supermarket. From past experience, it is known that 25% of the people entering the supermarket
make a purchase.
Let X be the number of customers who will make a purchase.
1. What are the possible values of the random variable X?
2. Construct the
X
P(X=x)
3. What is the probability that
a) at least four persons will make a purchase?
b) two or three persons will make a purchase?
c) at most two persons will make a purchase?
4. Out of the eight persons entering a supermarket, how many are expected to make a purchase?
5. Compute the standard deviation of the random variable X.
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