(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...

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Mathematics of Data Management - Probability distributiono

**Physics Forums | Science Articles, Homework Help, Discussion**