Prime number

Jan wrote any number from 1 to 20. What is the probability that he wrote the prime number?

Result

p =  0.4

Solution:

Solution in text p =







Leave us a comment of example and its solution (i.e. if it is still somewhat unclear...):

Showing 0 comments:
1st comment
Be the first to comment!
avatar




Our percentage calculator will help you quickly calculate various typical tasks with percentages. Would you like to compute count of combinations?

Next similar examples:

  1. Raffle
    tombola_tickets In the pool is numbers from 1 to 115. What is the probability that a randomly selected number is not a prime number?
  2. Numbers
    primes Write smallest three-digit number, which in division 5 and 7 gives the rest 2.
  3. Perctentages
    percent_24 35% of what number is 35?
  4. Percents
    percents2_10 How many percents is 900 greater than the number 750?
  5. Divisible by 5
    175px-5th_MarDiv How many three-digit odd numbers divisible by 5, which are in place ten's number 3?
  6. Shots
    lopta_5 Determine the percentage rate of keeper interventions if from 32 shots doesn't caught four shots.
  7. Probability - tickets
    zreby What is the probability that when you have 25 tickets in 5000 that you wins the first (one) prize?
  8. Sum 10
    dices11 What is the probability that two dice throw twice in a row will result the sum of 10?
  9. Percentages
    permutations_3_3 52 is what percent of 93?
  10. Basketball
    friends_1 Peter and Franta threw to the basket. Each had 20 attempts. Peter scored thirteen and twelve Franta. Give them success in percentage.
  11. The ball
    ball1_4 The ball was discounted by 10 percent and then again by 30 percent. How many percent of the original price is now?
  12. Profit gain
    percent_12 If 5% more is gained by selling an article for Rs. 350 than by selling it for Rs. 340, the cost of the article is:
  13. Frameworks is bad
    space Calculate how many percent will increase the length of an HTML document, if any ASCII character unnecessarily encoded as hexadecimal HTML entity composed of six characters (ampersand, grid #, x, two hex digits and the semicolon). Ie. space as:  
  14. Real estate 2
    penize_49 A real estate agent sold a lot for Php.550,000. If his agency pays at 10% commission, how much commission will he or she receive?
  15. Cinema tickets
    listky Cinema sold 180 tickets this Thursday, which is 20%. Monday 14%, Tuesday 6%, Wednesday 9%, Friday 24%, Saturday 12%, and Sunday 15%. How many tickets were sold per week?
  16. Enrollment
    enrollment The enrollment at a local college increased 4% over last year's enrollment of 8548. Find the increase in enrollment (x1) and the current enrollment (x2).
  17. Apples 14
    jablka_16 Maya bought 18 apples. She used 50% of the apples to make apple pies and 1/3 of the apples was mixed with other fruits to make salad. How many apples were left?