rob bought 15 concert tickets worth $322.50. Floor tickets cost $25 each while balcony tickets cost $17.50 each. How many tickets of each type did rob bye?

8 floor tickets and 7 balcony tickets.

Step-by-step explanation:

f+b=15

25f+17.50b=322.50

The age of an attendee with a z-score of -1.3 would be 19.8 years.

Step-by-step explanation:

Mean age of people at concert = μ = 24

Standard Deviation = σ = 3.2

The ages of people at concert are Normally Distributed, so we can use z-distribution to model the age of the people.

We are given that the z-score of an attendee at the concert is -1.3, we have to find the actual age of the attendee.  We can convert this z-score to the actual age by using the z-score formula. The formula to calculate the z score is:

Here, x represents the actual age of the attendee. Substituting the given values, we get:

This means, the age of an attendee with a z-score of -1.3 would be 19.8 years.