Blog

Suppose 18% of university students choose to take only online classes during a given semester. A random sample of 60 students is selected. (Round to 3 decimal places as needed.)   a. Find the probability that exactly 7 of the sampled students take only online classes. [a][a] b. Find the probability that at least 12 of the sampled students take only online classes. [b][b] c. Find the probability that between 10 and 18, inclusive, of the sampled students take only online classes. [c][c] d. Find the expected number of students who take only online classes in the sample. [d][d]

Suppose 38% of customers at a retail store make a purchase during a visit. A random sample of 45 customers entering the store is selected. (Round to 3 decimal places as needed.)   a. Find the probability that exactly 12 of the sampled customers make a purchase. [a][a] b. Find the probability that between 10 and 20, inclusive, of the sampled customers make a purchase. [b] c. Find the probability that at least 15 of the sampled customers make a purchase. [c][b][c] d. Find the expected number of customers who make a purchase in the sample. [d][d]

The following is a probability distribution table for a discrete random variable, X. x P(X = x) 20 [a] 35 0.34 40 0.23 55 0.14 a. Fill in the missing probability in the table, P(X = 20) b. Calculate the probability that X is more than 35. [b]

A coffee shop reports that the average wait time for customers to receive their drinks during morning hours is [a] minutes, with a standard deviation of [b] minutes. A random sample of [c] customers is selected. (Round to 3 decimal places as needed)   Calculate the standard deviation of the sample mean (aka the standard error). 

The following is a probability distribution table for a discrete random variable, X. x P(X = x) 20 [a] 35 0.34 40 0.23 55 0.14 a. Fill in the missing probability in the table, P(X = 20) b. Calculate the probability that X is more than 35. [b]

If X is the number of football games won in a season, then X is a discrete random variable.

Classify the following variable as either qualitative or quantitative. If it is quantitative, also determine if it is discrete or continuous.   Variable: The brand of shoe worn

Classify the following variable as either qualitative or quantitative. If it is quantitative, also determine if it is discrete or continuous.   Variable: The amount of rainfall in a day

There are 700 employees at Company A. Based on the above graph, answer the following questions. a. How many employees have a salary between $50,000 and $125,000? [a] b. The distribution is best described by which shape? [b] c. Based on the shape, what is the best measure of central tendency? [c]

Answer the following question based on the boxplot below: a. Based off the boxplot above, the shape of the distribution is [a]. b. Based off your answer in part a, the best measure of central tendency is [b]. c. Based off your answer in part a, the best measure of dispersion is [c]. d. What is the value of Q1?  [d]