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STA 122

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Created by Oladeji Timilehin Daramola

exam - STA 122

NOTE: The quiz is meant for revision purpose only!

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An experiment has four equally likely outcomes: E1,E2,E3,andE4.What is the probability that E2 occurs?

A production department has 35 similar milling machines. The number of breakdowns on each machine averages 0.06 per week. Determine the probabilities of less than three machines breaking down in any week.

Constructing a frequency distribution

Given the following set of data:9,8,5,x,6,7.If the arithmetic mean is 6.5,find x.

Let X be the number of borehole a company drill with a mean of 3 borehole per town in Nigeria .What is the probability that the company drill at least one borehole in a randomly selected town.

A fair die is thrown twice and the two outcomes are added. What is the probability of getting an odd number? Hint: There are 36 outcomes in all.

The_________is often the preferred measure of central tendency if the data are severely
skewed

Suppose out of 10 objective questions in STA 122, five are to be answered. How many different sets of questions are possible?

Which of the following is a correct use or application of Statistics?

The differences between the upper and lower boundary of class is called____________

When are events said to be collectively exhaustive ? This is when

Measure of dispersion (or variability)includes the following except

A couple decides to have children until either (i)they have both a boy and a girl or (ii)they have three children .What is the set of outcomes? Write B for boy ,G for girl ,and write them in birth order.

Which of the following is not an example of a ratio scale variable?

Consider the experiment of drawing 1 card from a deck of 52 cards and observing whether or not the card is a spade. What is the probability of drawing a spade?

A die is rolled and a coin is tossed, find the probability that the die shows an odd number and the coin shows ahead.

An experiment has four equally likely outcomes :E1,E2,E3,andE4.What is the probability that any three of the outcomes occur(e.g.,E1or E2or E4)?

Let P(A)=0.60,P(B)=0.45 and P(A∩B)=0.30.FindP(A|B).

Given the set of data 1,5,6, 10,3 the range and the mean deviation respectively are

A class has 24 students.4 can represent the class at an exam board. How many combinations are possible when choosing this group?

All correlation coefficients share in common the property that they range between

A statistician collected data on In come per person 200 individuals. He has a mean of 12482.3 and median 6975.14.Which of these is likely to be true?

Let X be the number of boreholes a company drill with a mean of 3 borehole per town in Nigeria. What is the probability that the company drill at most one borehole in a randomly selected town?

The variance measures deviation around the :

A random variable X is a discrete random variable if

Suppose P(A)=0.70,P(B)=0.20 and P(A∩B)=0.15.Find P(A∪B)

Suppose that we have a samples pace S={E1,E2,E3},where E1,E2 and E3 denote the experimental outcomes and the following probability assignments are given for the sample events P(E1)=0.3,P(E2)=0.25,P(E3)=0.45.LetA={E1,E2}.Find P(A).

Two events A and B are said to be INDEPENDENT if.......

Sample space is defined as

Tay-Sachs disease is a rare but fatal disease of genetic origin occurring chiefly in infants and children, especially those of eastern European extraction. If a couple are both carriers of Tay Sachs disease, a child of theirs has probability 0.25 of being born with the disease. If such a couple has four children, what is the probability that all the children will have the disease ?

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