Blog

Suppose  you have a cybersecurity system designed to detect phishing emails. You know that: 1% of all emails are phishing emails. Given a phishing email, your system correctly identifies 99% of the time. it incorrectly identifies 1% of non-phishing emails as phishing. You receive an email that the system identifies as a phishing email. What is the probability that this email is actually a phishing email?

Determine whether the statement is true or​ false, and explain why: The sum of a 2 by 3 matrix and a 4 by 5 matrix is a 6 by 8 matrix.

If A and B are events such that P(A) = 0.5 and ​P(A U ​B) = 0.9 , find​ P(B) when A and B are independent.

 what is the derivative of f(x) = 3×3+1

A card is drawn from a​ well-shuffled deck of 52 cards. Find the probability of drawing a 4 or an ace.

What is the sample space for an experiment where a coin is tossed and a die is rolled?

Determine whether the following pair of events are dependent or independent.  Two cards are drawn from separate decks . Events A and B are: A = {first card is a jack ​} B  = {second card is a nine}

Solve the following system of equations. Let z be the parameter. 3x + 5y – z = 1 4x + 7y + z = 4

G i v e n   1 – 2 3 0 2 – 4 – 2 – 1 1   W h a t   r o w   o p e r a t i o n   n e e d s   t o   b e   p e r f o r m e d   t o   g e t   t h e   e n t r y   ( 3 , 1 )   t o   b e   0 .

The metric base unit for length is the gram.