Statistics

9000139502

Level:

The average mass of

30

eggs on a plate is

60 g

. From this amount we remove five eggs. The total mass of these five eggs is

280 g

. Find the change in the average mass of the remaining eggs on the plate.

The average mass of eggs increases by

0.8 g

The average mass of eggs decreases by

4 g

The average mass of eggs increases by

4 g

The average mass of eggs increases by

12 g

9000139503

Level:

The average mass of the pear in a basket is

150 g

. Find the change in the average mass of the pears in the basket if one pear has been removed from the basket.

There is not enough information to solve this problem.

The average mass of the pears increases by

7.5 g

The average mass of the pears decreases by

7.5 g

The average mass of the pears does not change.

9000139504

Level:

The average salary of five employees is

3 000 Euro

. This group of the employees is expanded by one new person. The salary of the new person is

2 400 Euro

. Find the change in the average salary of this group.

The average salary decreases by

100 Euro

The average salary decreases by

480 Euro

The average salary increases by

400 Euro

The average salary increases by

480 Euro

9000139505

Level:

The average mass of twelve oranges is

120 g

. To this amount we add another six oranges with the average mass

150 g

. Find the change in the average mass of oranges.

The average mass increases by

10 g

The average mass increases by

8.3 g

The average mass increases by

25 g

The average mass decreases by

8.3 g

9000139506

Level:

There are eight mandarins of average mass

90 g

in the box. We got two another mandarins and add them to the box. The new average mass of the mandarins in the box is

92 g

. Find the average mass of the two added mandarins.

100 g

92 g

96 g

106 g

9000139507

Level:

The average mass of five melons is

2 400 g

. We have to add another melon such that the new average value of all six melons will be

2 420 g

. Find the mass of the sixth melon.

2 520 g

2 540 g

2 480 g

2 460 g

9000139509

Level:

The average year income in a company was

200 000 Euro

two years ago. This income increased by

10 %

a year ago and by

80 000 Euro

this year. Find the average percentage increase in the average income per one year and round to the nearest percent.

22 %

23 %

25 %

50 %

9000139510

Level:

The price of a butter increased by

8 %

in the year

2013

and by

34 %

in the year

2014

. Find the average percentage growth of the price of the butter per one year in the period

2012

2014

. Round your answer to the nearest percent.

20 %

21 %

14 %

26 %

1003025201

Level:

Two hunters, Adam and Boris, competed in target shooting. Adam hit the target points

{10; 10; 9; 8; 7}

, and Boris

{10; 10; 9; 9; 6}

. Who is the winner? In the case of the same sum of gained points the shooting accuracy is decisive. Which of the following statements is true, if the accuracy is quantified by the variance of the points? (The variance is rounded to two decimal places.)

Adam won with the variance of

1.36 {points}^{2}

Adam won with the variance of

1.17 {points}^{2}

Boris won with the variance of

2.16 {points}^{2}

Adam won with the variance of

1.36 points

Adam won with the variance of

1.17 points

Boris won with the variance of

2.16 points

1003029401

Level:

Wooden boards were expected to be cut to the same length. After their cutting the resulting measured lengths are:

2.00; 2.02; 2.05; 2.02; 2.08; 2.11

(in meters). We use the standard deviation of board lengths to describe (quantify) the accuracy of cutting. Find the standard deviation of board lengths rounded to four decimal places.

0.0382 m

0.0381 m

0.0014 m

0.0015 m

9000139502

9000139503

9000139504

9000139505

9000139506

9000139507

9000139509

9000139510

1003025201

1003029401

Events

Akce

Interests

Zajímavosti

About portal

O portálu