Mean - practice problems - page 8 of 39
Number of problems found: 773
- Decoration
Jerry and Jane decided to decorate their common room. If Jerry painted it alone, it would take her 4 hours, and Jane 3 hours. How long would they paint the room if they painted together? - Team average height
There are 12 players on the team, with an average height of 185 cm. If the average height of a new player increased by 1 cm after he joined the team, what would be his height? - CFO Director
The financial director has determined the following profitability scenarios for a new branch of the company: Profit of 5 million CZK with probability 0.1. Profit of 3 million CZK with probability 0.3. Profit of 1 million CZK with probability 0.4. Loss of - Test class results
Eighth-grade test results: 8D =? 8B = 47 8 A = 44 8E = 37 8 C = 28 Class 8 A achieved exactly the average result. How many points did the winning class 8D get? By what % is class 8B more successful than class 8 C? - Class grade average There are 30 students in the class. Five had a mark three — other twos and ones. The average grade was 1.9. How many students got mark one?
- Class weight average
There were 31 students in the class, and the arithmetic average weight was 43 kg. Calculate the average weight in the class if a student weighing 91 kg has been added to the class. - Teacher paper correction
The new teacher corrects papers for 9 hours, and the older one fixes them in 6 hours. How much will they repair together? - Class height average There were 21 pupils in the class, and arithmetically, the average height of these pupils was 163 cm. Calculate what the average height in the class will be if: a) A 159 cm tall student was added to the class b) A 169 cm tall student left the class
- Digger ditch together
An older digger would dig a ditch by himself in 6 hours. A younger digger can handle the same trench in 3 hours. How long would it take them to dig if they worked together? - Company meadow mowing
The K+S company will mow the meadow in ten hours. The Kosačka company mows the meadow in six hours. How many hours would these companies mow one such meadow if they worked together? - Open simultaneously
An empty tank is filled with inflow in 30 minutes. A full tank is emptied in 75 minutes with an open drain. How long does it take for an empty tank to fill up if both the inlet and outlet are open simultaneously? - Number distant equally
Which number is also distant from the numbers 5.3 and 7.7 on the number line? - In the primary In a primary school every year a knowledge competition is organised, in which each competitor can get at most 15 points. This year the average point achievement of the competitors, rounded to tenths, was 10.4. Jožko realised after the competition that som
- In the apple
In an apple orchard, 12 part-time workers were picking apples for 5 days. Their daily performance in kilograms was as follows: 155.6; 168.2; 175; 159.4; 169.5. When calculating, round the results to hundredths. a) On average, how many kg of apples did the - Tree watering distance
There are 10 trees in a row with the same spacing x = =3 meters. How many meters does a person travel if he waters two trees at once - Arithmetic mean relation
If the arithmetic mean of the numbers a1, a2, a3, a4, and a5 is the number A, the arithmetic mean of the numbers a1, a2, a3, and a4 is the number B, then what is a5 equal to? - Cooperatives - table
There are 3 agricultural cooperatives and one private farmer in the district. The table shows the wheat yields per hectare in t/ha and their areas in hectares for 4 entities. What was the average wheat yield in the district? Entity; Yield [t/ha]; Area [ha - Excavator pit days Two excavators dig a pit in 12 days. How much shorter will this job take if 8 excavators dig the hole? In 3 or 9 days?
- Potato harvesting
Due to a large potato harvest this year, the farm bought a new, more powerful sorter in addition to the old one. With both machines running simultaneously, the daily harvest is processed in 12 hours. If only the old machine were used, it would need 10 mor - Family height statistics
The average height of a member of a family of five is 1.5 m, the mode of their height is 1.2 m and the median is 1.6 m. Find out the heights of individual members of this family if you know that they are integers in dm.
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