Question

what is probality density function​

Answer 1

In probability theory, a probability density function, or density of a continuous random variable, is a function whose value at any given sample in the sample space can be interpreted as providing a relative likelihood that the value of the random variable would equal that sample.

by Wikipedia

Answer 2

ɪɴ ᴘʀᴏʙᴀʙɪʟɪᴛʏ ᴛʜᴇᴏʀʏ, ᴀ ᴘʀᴏʙᴀʙɪʟɪᴛʏ ᴅᴇɴsɪᴛʏ ғᴜɴᴄᴛɪᴏɴ, ᴏʀ ᴅᴇɴsɪᴛʏ ᴏғ ᴀ ᴄᴏɴᴛɪɴᴜᴏᴜs ʀᴀɴᴅᴏᴍ ᴠᴀʀɪᴀʙʟᴇ, ɪs ᴀ ғᴜɴᴄᴛɪᴏɴ ᴡʜᴏsᴇ ᴠᴀʟᴜᴇ ᴀᴛ ᴀɴʏ ɢɪᴠᴇɴ sᴀᴍᴘʟᴇ ɪɴ ᴛʜᴇ sᴀᴍᴘʟᴇ sᴘᴀᴄᴇ ᴄᴀɴ ʙᴇ ɪɴᴛᴇʀᴘʀᴇᴛᴇᴅ ᴀs ᴘʀᴏᴠɪᴅɪɴɢ ᴀ ʀᴇʟᴀᴛɪᴠᴇ ʟɪᴋᴇʟɪʜᴏᴏᴅ ᴛʜᴀᴛ ᴛʜᴇ ᴠᴀʟᴜᴇ ᴏғ ᴛʜᴇ ʀᴀɴᴅᴏᴍ ᴠᴀʀɪᴀʙʟᴇ ᴡᴏᴜʟᴅ ᴇϙᴜᴀʟ ᴛʜᴀᴛ sᴀᴍᴘʟᴇ.