Math probability question help Hello everyone, I was having a bit of trouble on a question regarding probability. Hoping someone understands it and might be able to help me reach the answer! The question is: Let the random variable X represent the profit made on a random clothing store on Main Street. Assume X is normal with a mean of $360 and a standard deviation of $50. 31. What is P(X > $400)? A) 0.2119 C) 0.7881 B) 0.2881 D) 0.8450 The answer here is A but I have no idea how to reach it. Any help would be appreciated.
Anyone good with proofs? math The question im working on here is... This problem involves prime numbers. A number p is called prime if it is a natural number (i.e. positive integer) such that the only integers that divide it without remainder are 1; 1; p; and p. Examples of primes include 2; 3; 5; 7; 11; :::. The number 1 is NOT prime. Also, note that 2 is the only even prime number (make sure you understand why). Consider the following statement. If it is true, prove it. If it is false, fi nd a counterexample. Let p be a prime number. Then the number p^2 + p + 2 is not prime. I have to prove it if its true or provide a counterexample if false. I am kind of hopeless with proofs here and any help would be great so I can finally be done with
Help With Proofs Math Im working on a problem that states: (A x B)'=(A' x B) U (A x B') U (A' x B') Note that '=complement and x is the cartesian product for sets such as (x,y) where x=a and y=b. Im trying to prove this problem but im not sure how to prove go about working through it with the (A' x B) U (A x B') that is added in. I can do it just fine when its just (A x B)'=(A' x B'). Any help is appreciated because ive been trying to figure this out for 2 hours now =_= </3
Help with proofs math Hey guys, Basil has been helpful to me in the past with proofs so I'm coming to you guys again for a bit of assistance on a proof problem. Question: Let m and n be integers. Prove that if m^2-3n is even, then n^2-3m must also be even. Not really sure where to go with this one as I struggle with proofs as it is. Any help would be appreciated!
Math question help Hello, I am having some difficulty understanding a math problem that I know is not that difficult but it still confuses me. The question is "Is it possible for both A ⊆ B (A relation B) and A ∈ B (A set B) to be true." The big problem I am having is that I cannot figure out how the relation symbol and the set symbol work and since I do not have my math book yet, I am finding it difficult to figure this out via google. Any help at all would be good.