Stats

Can you tell me what ∑xy means? Like is in the sum of all x times y or what?

  1. 0
  2. 3
asked by Carol
  1. the ∑ is the sigma symbol and stands for a summation.
    There is probably something like x = ? and y = ? below the symbol and a pair of numbers above it
    e.g.
    if it says x = 2, y=3 to whatever on top, then it would mean
    (2)(3) + (3)(4) + (4)(5) + ....

    1. 0
    posted by Reiny
  2. Thanks so much!!!

    1. 0
    posted by Carol

Respond to this Question

First Name

Your Response

Similar Questions

  1. arithmetic

    1. The first and last term of an A.P are, a and l respectively, show that the sum of nth term from the beginning and nth term from the end is a + l. 2. If mth term of an A.P be 1/n and nth term be 1/m, then show that its mnth term
  2. arithmetic

    1. The first and last term of an A.P are, a and l respectively, show that the sum of nth term from the beginning and nth term from the end is a + l. 2. If mth term of an A.P be 1/n and nth term be 1/m, then show that its mnth term
  3. 6th grade Math

    Two number cubes rolled 150 times.Estimate how often the following occured: A sum less than 4 appeared 15 times. A sum of 7 appeared 11 times. A sum of 6 or greater appeared 85 times.
  4. Math

    How do I simplify this: (The ^ symbol means 3) -3(12)-{5(-4)-2^ I tried it,and got-8,however when I rechecked my work I got -64. Please help! Please help! where is the other } in the equation? And ^ means to the power so -2^3
  5. Math

    If you toss a pair of dice 1,000 times, how many times would you expect to get a sum of 12 as the result? 1.)about 12 times 2.)about 27 times 3.)about 36 times 4.)about 100 times The lesson doesn't show me how to work this. Whats
  6. math help

    four more than seven times y = ? Eights less than seven-eights of w = ? One ninth of the sum of p and q = ? The product of twice b and the sum of four and p = ? the sum of m and five more than twice m = ? the cube of four times y
  7. Probability

    Roll 3 dice. What is the probability of getting a sum of: A) sum of 7: 15/216 B) sum of 8: 21/216 C) sum of 11: 27/216 D) sum of 12: 25/216 Are these correct? How many ways are there to choose 3 numbers ranging from 1 to 6 such
  8. 8th Grade Math

    *I NEED THESE IN ALGEBRAIC EXPRESSIONS! 1.) The larger of two numbers is 1 less than 3 times the smaller. Their sum is 63. Find the numbers. 2.) Find two numbers whose sum is 92, if the first is 4 more than 7 times the second. 3.)
  9. URGENTlast question for Math

    Which word phrase can be used to represent the algebraic expression 4(21+n)? 4 plus the sum of 21 and a number n 4 times the product of 21 and a number n*** 4 times the sum of 21 and a number n 4 less than the sum of 21 and a
  10. Comparing

    A Middle Eastern restaurant recorded the number of times 2 dinner appetizers, hummus and baba ghanoush, were ordered every day for 1 month. The restaurant calculated the mean number of times each appetizer was ordered and the MAD

More Similar Questions