The conditional relative frequency table was generated using data that compared the cost of one ticket for a
performance and the method by which the ticket was
purchased.
Given that Lorenzo paid more than $30 for a ticket,
what is the probability that he purchased the ticket at
the box office?
O 0.14
Ticket Purchases
O 0.18
No More
than $30
More than $30
Total
0.30
0.7
0.86
0.86
0.82
Purchased
Online
Purchased
at the Box
Office
0.3
0.14
0.18
Total
1.0
10
No

Based on what i know about mean, this doesn't add up.

How many real and imaginary solutions does the equation x^2-3x=-2x-7 have?

Quick! a survey of 57 customers was taken at a bookstore regarding the types of books purchased. the survey found that 33 customers purchased mysteries, 25 purchased science fiction, 18 purchased romance novels, 12 purchased mysteries and science fiction, 9 purchased mysteries and romance novels, 6 purchased science fiction and romance novels, and 2 purchased all three types of books. a) how many of the customers surveyed purchased only mysteries? b) how many purchased mysteries and science fiction, but not romance novels? c) how many purchased mysteries or science fiction? d) how many purchased mysteries or science fiction, but not romance novels? e) how many purchased exactly two types of books?