Statistics

posted by .

Selecting a letter of the alphabet: If 3 letters of the alphabet are selected at random, find the probability of getting at least one letter "x". Letters can be used more than once.

My answer was: P(at least 1 "x) = 1 - (25/26)^3 = 1951/17576 or 0.11

Is this correct?

  • Statistics -

    Most problems of the "at least" type are best done by subtracting from total.

    P(at least one x) = 1 - P(no x's) = 1 - (25/26)^3 = 0.111 (3dp)

    So, Yes, you are correct.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Maths

    1)A two-figure number is written down at random. Find the probability that a)the number is greater than 44 b)the number is less than 100 2)A letter is picked at random from the english alphabet. Find the probability that a)the letter …
  2. English expression

    A. Looking at the capital letters in Italic script carefully, trace each letter in the alphabet. There are two four lines in A, and the alphabet are written on the four line dimly. <~~I don't understand this at all! They<~~Who …
  3. Math

    If a license plate has 3 letters and then 3 numbers, what are the chances (probability?
  4. 3rd grade math hw help!

    hello all, my daughter come home with a math homework "Alphabet Polygons" I have no idea how to use the letters in the alphabet to answer the questions. Please HELP! The questions are as follow: 1) You can make polygons of some of …
  5. 8th grade Math

    Penelope created a game using a bag of 26 tiles, each with a different letter of the alphabet written on it. She uses a stopwatch to time how fast she can create one 5-letter word from a set of five randomly selected letters. To play …
  6. math

    The English Alphabet has 20 letters more than one−fourth the number of letters in the Greek Alphabet. The English Alphabet has 26 letters. Which of the following equations would you use to find the number of letters, g, in the …
  7. statistics

    suppose you roll two number cubes and pick a letter of the alphabet at random. find the probability you will roll two odd numbers and pick one of the letters k, l, or m.
  8. probabilities

    Jeff has a box containing 26 tiles, each with a different letter of the alphabet. He randomly draws 4 letters, one at a time without replacement. What is the probability that he will choose the letters N, W, B, T?
  9. Math

    I have a question; What is the probability that a selected letter from the alphabet of 26 letters is selected at random is "either a consonant OR a vowel"?
  10. math

    each letter of the alphabet is placed in a bag. One letter is drawn and not replaced. If three letters are drawn without replacement, what is the probability that all three letters chosen are NOT any of the five vowels, a, e, i, o, …

More Similar Questions