For a city parade, the organizers originally estimated they needed about 5200 water bottles for the crowd of 3000 people. Now, they estimate that about 4700 people will come. How many water bottles should they prepare? Write ONLY your answer(s) in the box below. On your own paper, show all your work and justify your answer(s). You will be submitting the paper at the end of this test. 

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Based on the Richter scale, a magnitude 3.5 earthquake has 10 times as much energy as a magnitude 2.5 earthquake.

A user code consists of one alphabet letter and a single-digit number (like “A5” or “S9”). How many user codes are possible?

Which one of the following is logically equivalent to the statement “If you are under 21, you cannot enter here”?

Suppose the length of a baseball game is normally distributed with a mean of 150 minutes and a standard deviation of 30 minutes. Then, the z-score (z-value) of a game that lasts for 180 minutes is 

A bakery shop sells five different cakes, but you can buy only two. There are

The table below shows how many male and female applicants were hired at a large company.  Hired Not Hired Total Male 140 80 220 Female 60 50 110 Total 200 130 330 (a) Find the probability that an applicant was hired given that it was a male applicant.  (b) Find the probability that an applicant was a male given that the applicant was hired.  Write ONLY your answer(s) in the box below. On your own paper, show all your work and justify your answer(s). You will be submitting the paper at the end of this test. 

What type of antibodies would be found in the gamma region of a serum electrophoresis of a newborn patient? 

Which of the following would be an effective therapy for rheumatoid arthritis?