(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A spinner has eight equally-sized sectors, numbered 1 through 8. What is the probability that the arrow on the spinner will stop on a prime number?

2. Relevant equations

P(x) = 1 / n, out come of a uniform probability distribution

P(x) = Probability distribution

n = Total # of possible outcomes

3. The attempt at a solution

n = 8, since the total number of possible outcome range from 1 through 8

P(x) = 1/n

Prime numbers are 1, 3, 5, 7

*Note that some textbooks don't include 1 as a prime number

P(x) = 1/n

= 1/8

** This is wrong but that's how it seems like it is suppose to be done

P(x) = 4/8

4 = total number of primes

P(x) = 1/2 or 3/8 ( if you don't consider 1 as a prime number)

** this is the correct answer

The second way of solving it is the correct answer but what i don't understand is that the formula is P(x) = 1/n, why did 1 become a 4, how would i know that i'm suppose to change the 1? and yes i have checked the 1 is not an L or an I...

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# Mathematics of Data Management - Probability distributiono

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