STATISTICS - Jamb Mathematics Past Questions and Answers

Question 181:

• JAMB 1997

\(\begin{array}{c|c} Age & 20 & 25 & 30 & 35 & 40 & 45\\
\hline Number of people & 3 & 5 & 1 & 1 & 2 & 3\end{array}\)
Find the median age of the frequency distribution in the table above.

A. 20
B. 25
C. 30
D. 35

Question 182:

• JAMB 1997

Find the difference between the range and the variance of the following set of numbers 4, 9, 6, 3, 2, 8, 10, 5, 6, 7 where \(\sum d^2\) = 60

A. 2
B. 3
C. 4
D. 6

Question 183:

• JAMB 1997

In a basket of fruits, there are 6 grapes, 11 bananas and 13 oranges, if one fruit is chosen at random, what is the probability that the fruit is either a grape or a banana?

A. \(\frac{17}{30}\)
B. \(\frac{11}{30}\)
C. \(\frac{6}{30}\)
D. \(\frac{5}{30}\)

Question 184:

• JAMB 1997

A number is selected at random between 10 and 20, both numbers inclusive. Find the probability that the number is an even number

A. \(\frac{5}{11}\)
B. \(\frac{1}{2}\)
C. \(\frac{6}{11}\)
D. \(\frac{7}{10}\)

Question 185:

• JAMB 1997

Find the standard derivation of the following data -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5

A. 2
B. 3
C. \(\sqrt{10}\)
D. \(\sqrt{11}\)