three questions attached

- Is this a valid probability distribution?
**Select****Yes, because all f(x) are ≥ 0 and sum of f(x)=1****Yes, because all f(x) are ≤ 0 and sum of f(x)=1****Yes, because all f(x) are ≥ 0 and sum of f(x)>1****Yes, because all f(x) are = 0 and sum of f(x)=1****Item 1**- What is the probability that x = 31 (to 2 decimals)?
- What is the probability that x is less than or equal to 24 (to 2 decimals)?
- What is the probability that x is greater than 31 (to 2 decimals)?

- Attachment 1
- Attachment 2
- Attachment 3

The probability distribution for the random variable x follows .XF ( X )200 . 21240. 16310 . 28370 . 35a . Is this a valid probability distribution ?"Select$b . What is the probability that * = 31 ( to 2 decimals ) ?C . What is the probability that * is less than or equal to 24 ( to 2 decimals ) ?d . What is the probability that x is greater than 31 ( to 2 decimals ) ?