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Expert: Robi Bhattacharjee - 12/11/2008


Question
The directions say find the area of the indicated sector(s). Find the probabilty of spinning the color blue. If there are 5 sections in a pie chart and each section is labeled 72 degrees and two of the sections say blue how do i solve?

Answer
Hi Derika,

Well, you don't need to find the area of the sectors. You just know that  the spinner has to land in 2*72 degrees since there are two sections. So the probability is 72*2/360 since there are 360 degrees total. This simplifies to 2/5.



I hope this helped
Robi

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Robi Bhattacharjee

Expertise

I can answer a variety of questions on mathematics. Questions on trigonometry, calculus(preferably single variable), algebra, geometry, and number theory will be answered. I cannot answer questions on abstract branches of mathematics such as group theory. I also cannot answer questions on statistics. In number theory, I can answer questions on congruences, prime numbers, units, functions, and the riemann-zeta function.

Experience

I have studied advanced math my entire life. I started calculus in sixth grade. I have attended numerous math competitions and I am attending math organizations such as the San-Diego math circle. Also, this year I have been invited to the USAMO which is a prestigious math competition (Every year the USAMO invites 500 students from across the USA to participate in this competition. The top 6 go to represent the USA in the International Math Olympiad).

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I am in the San Diego Math Circle

Education/Credentials
I am entering high school and have received a perfect score and the STAR test 5 times in a row. I also have gotten recognitions in the AMC 10, AIME, Math Counts, and ARML. Additionally, I have won the San Diego Math Olimpiad twice in a row.

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