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Question
At a certain university, 40% of the students who take basic statistics are sophomores, 45% are juniors, and 15% are seniors. From the registrar, we find that 20% of the sophomores get As. Out of the juniors, 30% get As and a whopping 40% of seniors get As. Given that a student got an A in statistics, what is the probability that he or she is a senior?
so you have .40x, .45x, and .15x
.20(.40)x or .08x
.30(.45)x or .135x
.40(.20)x or .08x
(.08x)/(.08x + .135x + .08x) = .08x/.295x or 27.12%
i'm not 100% sure since i'm not good at probabilities involving percentanges, so i'd recommend going to answers.yahoo.com seeing what they say, before you rate me.
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Advanced Math
Answers by Expert:
Sherman D.
Expertise
I can answer questions dealing in mathematics of all kinds except for Physics and Calculus, but i can answer questions in Pre-Calculus and Chemistry. I can also answer questions in Recipes of all kinds. I can find games cheats/walkthroughs, but i can`t find a specific game online or offline. I can also do history and recipes for alcoholic beverages.
Experience
Mathematics, Recipes, History, and Games.
Education/Credentials
High School graduated. I graduated with honors, and i was in Beta Club for a year and a half.
Awards and Honors
Principle's list and A and B honor roll in high school only.
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