Problems from The median

Fill in the points of every team of the following classification of the teams of the League of the Spanish soccer:

Team

Points

Barcelona

 

Real Madrid

 

Seville

 

Valencia

 

Villareal

 

Atlético

 

Malaga

 

Deportivo

 

Majorca

 

Almeria

 

Athletic

 

Racing

 

Betis

 

Osasuna

 

Getafe

 

Sporting

 

Recreativo

 

Valladolid

 

Espanyol

 

Numantia

 

See development and solution

Development:

We define the following scorings.

Team

Points

Barcelona

81

Real Madrid

75

Seville

63

Valencia

56

Villareal

56

Athletic

54

Malaga

53

Deportivo

53

Majorca

53

Almeria

51

Athletic

50

Racing

41

Betis

40

Osasuna

40

Getafe

33

Sporting

33

Recreativo

33

Valladolid

29

Espanyol

28

Numantia

28

  • Bearing in mind that $$20$$ teams are taking part, there will be two central values. Since it is an arranged classification, it is not necessary to do a table of cumulative frequencies. It is enough to at the scorings of the teams in positions $$10$$th and $$11$$th.

Almeria - $$51$$ points

Athletic - $$50$$ points

And so, the median will be the average of $$50$$ and $$51$$: $$50,5$$ points.

  • As there are $$6$$ teams in position to play in Europe the next year, we divide both points of the third and fourth team.

$$$\dfrac{63+56}{2}=59,5$$$

The median is $$59,5$$ points.

  • The median will be the value of the scoring of the team in the intermediate position of those who are in relegation (that is, the scoring of the Espanyol).

And so, the median of the teams in relegation is $$28$$ points.

Solution:

Team

Points

Barcelona

81

Real Madrid

75

Seville

63

Valencia

56

Villareal

56

Athletic

54

Malaga

53

Deportivo

53

Majorca

53

Almeria

51

Athletic

50

Racing

41

Betis

40

Osasuna

40

Getafe

33

Sporting

33

Recreational

33

Valladolid

29

Espanyol

28

Numantia

28

  • Mode = $$50,5$$ points
  • Mode = $$59,5$$ points
  • Mode = $$28$$ points
Hide solution and development

Create a list of the weight (rounded to the kilogram) of $$7$$ people. Then, calculate the median of the weights.

See development and solution

Development:

$$60, 65, 69, 70, 75, 95, 99$$

The central value of the list, which has $$3$$ values above and $$3$$ below, is $$70$$ kg.

Solution:

$$60, 65, 69, 70, 75, 95, 99$$. M=$$70$$ kg

Hide solution and development

Create a list of four results of a dice. Then, calculate the median of the result of throwing the dice.

See development and solution

Development:

$$1, 4, 5, 6$$

We calculate the average of the central values (since there is an even number of elements). $$$\dfrac{4+5}{2}=4,5$$$

Solution:

$$1, 4, 5, 6$$. M=$$4,5$$.

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