BANA 1 Exam 2 (2025/2026) | Solved Q&A on Probability, Distributions & Statistical Analysis

BANA 1 – Exam 2 2025/2026 Exam
Questions and Answers | 100% Pass



If two events are independent, then - 🧠 ANSWER ✔✔the product of their

probabilities gives their intersection.


Two events with nonzero probabilities - 🧠 ANSWER ✔✔cannot be both

mutually exclusive and independent

If A and B are mutually exclusive events with P(A) = 0.295, P(B) = 0.32,

then P(A | B) = - 🧠 ANSWER ✔✔0.0000


If A and B are independent events with P(A) = 0.2 and P(B) = 0.6, then P(A

union B) = - 🧠 ANSWER ✔✔0.68


Bayes' theorem is used to compute - 🧠 ANSWER ✔✔the posterior

probabilities

The company identified in Chapter 5, Statistics in Practice is - 🧠 ANSWER

✔✔not a company but precinct polling locations




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,The Statistics in Practice example in Chapter 5 focuses on - 🧠 ANSWER

✔✔polling booths or machines


Chapter 5 focuses on - 🧠 ANSWER ✔✔probability distributions


A random variable that can assume only a finite number of values is

referred to as a(n) - 🧠 ANSWER ✔✔discrete random variable


Forty percent of the students who enroll in a statistics course go to the

statistics laboratory on a regular basis. Past data indicates that 65% of

those students who use the lab on a regular basis make a grade of A in the

course. On the other hand, only 10% of students who do not go to the lab

on a regular basis make a grade of A. If a particular student made an A,

determine the probability that she or he used the lab on a regular basis.

Enter your answer rounded to four decimal places. Use a tree diagram to

answer this question. - 🧠 ANSWER ✔✔0.8125


A numerical description of the outcome of an experiment is called a - 🧠

ANSWER ✔✔random variable


The number of customers that enter a store during one day is an example

of - 🧠 ANSWER ✔✔a discrete random variable



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, An experiment consists of determining the speed of automobiles on a

highway by the use of radar equipment. The random variable in this

experiment is a - 🧠 ANSWER ✔✔continuous random variable


The weight of an object is an example of - 🧠 ANSWER ✔✔a continuous

random variable

A measure of the average value of a random variable is called a(n) - 🧠

ANSWER ✔✔expected value


Random variable x has the probability function f(x) = X/6, for x = 1, 2 or 3

The expected value of x is - 🧠 ANSWER ✔✔2.333


The student body of a large university consists of 60% female students. A

random sample of 8 students is selected.What is the expected number of

females selected? Round your answer to one decimal place. - 🧠 ANSWER

✔✔4.8


The student body of a large university consists of 60% female students. A

random sample of 8 students is selected.What is the probability that among

the students in the sample exactly four are female? Use an Excel function

and round your answer to three decimal places. - 🧠 ANSWER ✔✔0.232



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