## All Tasks

#### Sibling Survey

The 24 students in a class conducted a survey on the number of siblings every student has. On average, a student in this class has about 1,83 siblings. The number of students with 1 and 2 siblings is equal. Exactly 6 Students in the class have more than 2 siblings.
Below, select the diagrams from the title image, that represent the collected data correctly.

# Standard diagrams

Training

7

#### Playing with cards and probabilities

A certain set of playing cards is made of twelve red cards and some black cards. A card is chosen at random from this set.
It is known that the probability of that card being red is 75%.
How many black cards are there in this set?

# One-stage random experiments

Reasoning

8

#### Exercise with a number to the power of an x value

In the following sum the power is $x$. Can you determine what the $x$ value is?
$2^2+5^2+3^{x} = 30$

# Powers

Reasoning

8

#### Animals at the zoo

The graph represents the percentages of the different groups of animals in a zoo. It is known that there are 5 animals of the category "Others" in the zoo.
How many animals are there in the zoo?

# Standard diagrams

Modeling

8

#### A Bag with balls of different colours

A bag contains only 10 red balls, 5 green balls and 5 blue balls.
If we take one ball out of the bag at random, we can say that:

# One-stage random experiments

Training

8

#### Graphic representations of fractions

How would you draw the fraction $\dfrac{5}{4}$?

# Fractions

Reasoning

6