Bulbs
In the box are 6 bulbs with power 75 W, 14 bulbs with power 40 W and 15 with 60 W. Calculate probability that a randomly selected bulb is:
Result
Result
Leave us a comment of example and its solution (i.e. if it is still somewhat unclear...):
Showing 0 comments:

Be the first to comment!
To solve this example are needed these knowledge from mathematics:
Next similar examples:
- Shooters
In army regiment are six shooters. The first shooter target hit with a probability of 49%, next with 75%, 41%, 20%, 34%, 63%. Calculate the probability of target hit when shooting all at once.
- Insurance
The owner of the house is insured against natural disasters and pays 0.04% annually of the value of house 77 Eur. Calculate the value of the house. Calculate the probability of disaster, if you know that 48% of the insurance is to pay damages.
- Average
The arithmetic mean of the two numbers is 71.7. One number is 5. Calculate the second number.
- Percent
From 99 children who participated in the ski course were 23 excellent skiers, 13 good and 20 average and the rest were beginners. Calculate this data in percentages.
- Raffle
In the pool is numbers from 1 to 115. What is the probability that a randomly selected number is not a prime number?
- Shirt
Mrs. Vítková bought each of his three children the same shirt paid CZK 1,000. Saleswoman she returned 568,60 CZK. What was the price of one shirt?
- 100 %
How much is 100%, if 17 % is 1169?
- Customer
A customer purchase three (3) writing pads from a store. She receive k9.70 change from a k10.00 note . How much was it's writing pad cost?
- Obtuse angle
Which obtuse angle is creating clocks at 17:00?
- Bicycle
The bicycle pedal gear has 36 teeth, the rear gear wheel has 10 teeth. How many times turns rear wheel, when pedal wheel turns 120x?
- Salary
Mr. Vesely got for work 874 CZK (Czech Republic Koruna). Mr. Jaros got twice less than Mr. Vesely. How much CZK got Mr. Jaros?
- Combine / add term
Combine like terms 4c+c-7c
- Class
In 7.C clss are 10 girls and 20 boys. Yesterday was missing 20% of girls and 50% boys. What percentage of students missing?
- Iron
Iron ore contains 57% iron. How much ore is needed to produce 20 tons of iron?
- Seeds 2
How many seeds germinated from 1000 pcs, when 23% no emergence?
- Doctors
In the city operates 171 doctors. The city has 128934 citizens. How many citizens are per one doctor?
- Simple equation
Solve for x: 3(x + 2) = x - 18