anonymous
  • anonymous
Blocks numbered 0 through 9 are placed in a box, and a block is randomly picked. The probability of picking an odd prime number is 1/5 I THINK The probability of picking a number greater than 0 that is also a perfect square is BLANK? IDK THAT ONE
Mathematics
  • Stacey Warren - Expert brainly.com
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schrodinger
  • schrodinger
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anonymous
  • anonymous
whats a perfect square also
anonymous
  • anonymous
oh a odd prime number
anonymous
  • anonymous
whats a prime number

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jim_thompson5910
  • jim_thompson5910
A prime number is a number that only has factors of 1 and itself example: 29 is a prime number since only 1 and 29 are factors of 29
anonymous
  • anonymous
1/3 is the odd prime number answer
jim_thompson5910
  • jim_thompson5910
btw, the number 1 is NOT prime
anonymous
  • anonymous
I THINK
anonymous
  • anonymous
okay
anonymous
  • anonymous
im staying with 1/3 now i only dont understand what a perfect square is
jim_thompson5910
  • jim_thompson5910
a perfect square is a whole number that is the result of squaring some smaller whole number example: 49 is a perfect square because 7^2 = 7*7 = 49
anonymous
  • anonymous
alright so
jim_thompson5910
  • jim_thompson5910
here are all the blocks laid out |dw:1449281471506:dw|
jim_thompson5910
  • jim_thompson5910
circle the blocks that are prime numbers click the pencil of my drawing so you can draw on it
anonymous
  • anonymous
|dw:1449281540806:dw|
anonymous
  • anonymous
I think 2 was a mistake
jim_thompson5910
  • jim_thompson5910
4 is not prime because 2*2 = 4, so 2 is a factor of 4 6 is not prime because 2*3 = 6 same with 8, 8 = 2*4
anonymous
  • anonymous
are 5 and 7 prime
jim_thompson5910
  • jim_thompson5910
5 is prime because only 1 and 5 are factors of 5 7 is prime because only 1 and 7 are factors of 7 so yes to both
jim_thompson5910
  • jim_thompson5910
which two numbers are also prime?
anonymous
  • anonymous
okay so my first problem is correct 1/3 odd prime numbers
jim_thompson5910
  • jim_thompson5910
the primes are 2,3,5,7 |dw:1449281771450:dw| hopefully you agree?
anonymous
  • anonymous
i do
jim_thompson5910
  • jim_thompson5910
ok we just want the odd primes so we kick out 2 |dw:1449281869279:dw|
jim_thompson5910
  • jim_thompson5910
the odd primes are: 3,5,7
anonymous
  • anonymous
okay
jim_thompson5910
  • jim_thompson5910
there are 3 odd primes (3,5,7) out of 10 blocks total (0 through 9) so the probability of picking an odd prime is 3/10
anonymous
  • anonymous
ok okay i see how 1/3 was wrong now
jim_thompson5910
  • jim_thompson5910
the 3 up top is the number of ways to get an odd prime the 10 below is the total number of blocks to choose from (ie the total number of outcomes)
jim_thompson5910
  • jim_thompson5910
now I want you to circle the perfect squares for me
anonymous
  • anonymous
is 3 a perfect square
jim_thompson5910
  • jim_thompson5910
no
jim_thompson5910
  • jim_thompson5910
there is no whole number you can multiply by itself to get 3 as a result
anonymous
  • anonymous
I think 9 is
jim_thompson5910
  • jim_thompson5910
yep since 3*3 = 9
jim_thompson5910
  • jim_thompson5910
what else?
anonymous
  • anonymous
4
jim_thompson5910
  • jim_thompson5910
yep since 2*2 = 4
jim_thompson5910
  • jim_thompson5910
any more?
anonymous
  • anonymous
would 1 be correct
jim_thompson5910
  • jim_thompson5910
yep since 1*1 = 1
anonymous
  • anonymous
i think thats all
jim_thompson5910
  • jim_thompson5910
0 is as well because 0*0 = 0 BUT they say "picking a number greater than 0 " so even though 0 is a perfect square, we're not including it in the list of favored outcomes
anonymous
  • anonymous
okay so if it was only perfect squares up to 9 it would be 1/4 but since it asked greater than 0 it would be 1/3
jim_thompson5910
  • jim_thompson5910
how many numbers are both greater than 0 AND a perfect square?
anonymous
  • anonymous
1,4,9 so 3 numbers are pefect squares greater than 0
jim_thompson5910
  • jim_thompson5910
out of how many numbers total?
anonymous
  • anonymous
10 which was my mistake last problem
anonymous
  • anonymous
3 out of 10
jim_thompson5910
  • jim_thompson5910
so the probability is 3/10
jim_thompson5910
  • jim_thompson5910
yep
anonymous
  • anonymous
so both answers are 3/10
jim_thompson5910
  • jim_thompson5910
coincidentally, they happen to be the same
jim_thompson5910
  • jim_thompson5910
yes
anonymous
  • anonymous
thank you jim
jim_thompson5910
  • jim_thompson5910
you're welcome
anonymous
  • anonymous
16 is a perfect square also
anonymous
  • anonymous
just making sure
jim_thompson5910
  • jim_thompson5910
yes but it's not in the range from 0 to 9 but you are correct since 4*4 = 16 25 is as well since 5*5 = 25 36 is too, 6*6 = 36 etc etc
anonymous
  • anonymous
THANK YOU JIM THANKS ALOT I UNDERSTAND THIS ALL
jim_thompson5910
  • jim_thompson5910
I'm glad it's making sense now
anonymous
  • anonymous
I GOTTA GO NOW BUT THANKS YOU WERE GREAT HELP THANK YOU

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