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- A mixture of short answer and multiple-choice questions
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- Question 1 of 10
##### 1. Question

A four-sided tetrahedron was tossed 20 times. The outcomes of the hidden number were recorded.

\(\begin{array} {|c|c|} \hline

hidden \ number &frequencies \\ \hline

1 &4 \\ \hline

2 &6 \\ \hline

3 &5 \\ \hline

4 &5 \\ \hline

\end {array} \)Find the experimental probability of a “Three” or “Four”.

Experimental probability =

CorrectIncorrect##### Hint

\(\text{Experimental probability } = \dfrac{{\text{favourable outcomes }}}{{\text{total number of trials }}}\)

- Question 2 of 10
##### 2. Question

A box contains 1 black and 8 white balls. Find the probability of getting two same colours if replacement does not occur. Answer to two decimal places.

CorrectIncorrect - Question 3 of 10
##### 3. Question

Given \(P\left( A \right) = \dfrac{1}{2}\) and \(P\left( B \right) = \dfrac{1}{3}\), find \(P\left( {A\text{ or }B} \right)\), correcting to one decimal place.

CorrectIncorrect - Question 4 of 10
##### 4. Question

\(\begin{array} {|c|c|c|c|} \hline

&iPhone &Samsung &no \ phone \\ \hline

Year \ 7 &26 &21 &9 \\ \hline

Year \ 8 &38 &22 &4 \\ \hline

Year \ 9 &42 &35 &3 \\ \hline

\end {array} \)Find the probability that a randomly chosen student uses iPhone. Answer in decimal form.

CorrectIncorrect - Question 5 of 10
##### 5. Question

The Venn diagram below shows the number of students in group \(A\), \(B\) or \(C\). Find the number of students who not in both group \(A\) or \(B\).

CorrectIncorrect - Question 6 of 10
##### 6. Question

A score was added to the set of scores: \( 13, 18, 20, 20, 22 \) and \( 26 \). The new mean is equal to \( 19\). What score was added?

The score added was .

CorrectIncorrect - Question 7 of 10
##### 7. Question

Which measure would you use if you were looking to buy a house?

CorrectIncorrect - Question 8 of 10
##### 8. Question

Find the median of the scores.

\( \begin{array}{|c|c|} \hline

Score & Frequency \\ \hline

5 & 6 \\ \hline

6 & 7 \\ \hline

7 & 12 \\ \hline

8 & 4 \\ \hline

\end{array} \)There are scores.

So, the median is the th score.

Thus, the median is .

CorrectIncorrect - Question 9 of 10
##### 9. Question

Predict \(y\) when \(x = 8\)

\(y = \)

CorrectIncorrect - Question 10 of 10
##### 10. Question

Describe the strength of the linear relationship with correlation coefficient \(r = – 0.9\).

CorrectIncorrect