lector57
lector57 t1_j29y1ny wrote
Reply to ELI5: How do venomous snakes avoid being poisoned by the venom they inject into their prey? Are they somehow immune? by booksandteacv
Besides some substances are deadlier to some species than to other.
Imagina you give 🍫 chocolate to a 🐕 dog.. you ☠️ kill him since it's toxic 🤢 for dogs. Yet, you can have a tasty meaty dessert without problems because Choco is not bad for you
lector57 t1_j23o467 wrote
Reply to comment by Independent-Office80 in ELI5_Random Variables? What really is the difference btw finding the probability of say..."getting 2 heads in a coin tossed three times" and "Finding the Probability mass function of a Random Variable 2"?? Their concepts are so similar but I feel I'm thinking wrong and there's actually a difference! by Independent-Office80
It depends on the experiment/situation
lector57 t1_j23nv4r wrote
Reply to comment by Independent-Office80 in ELI5_Random Variables? What really is the difference btw finding the probability of say..."getting 2 heads in a coin tossed three times" and "Finding the Probability mass function of a Random Variable 2"?? Their concepts are so similar but I feel I'm thinking wrong and there's actually a difference! by Independent-Office80
Like in algebra
x² is a function. A formula. X is the variable
Substitute x=2 and you get a value
In prob the random variable X can take different values.
The mass function is a formula. Substitute a specific value of X and you get the probability of obtaining the result X in the experiment
lector57 t1_j23lvi7 wrote
Reply to ELI5_Random Variables? What really is the difference btw finding the probability of say..."getting 2 heads in a coin tossed three times" and "Finding the Probability mass function of a Random Variable 2"?? Their concepts are so similar but I feel I'm thinking wrong and there's actually a difference! by Independent-Office80
The coin tosses is your random experiment.
There are several possible results: 0, 1, 2,3 heads.
The number of heads obtained is the random variable. It's not fixed, you don't know the value until you perform the actual experiment.
The probability distribution is a formula that gives you the probability for each value.
So "what is the probability of obtaining 2 heads in 3 tosses" is exactly the same question as asking the value of the distribution (that is, probability mass function) when X=2
This is similar as in algebra... You have a function, for example f(x)=x² and you can ask it's value for any given x. For example when x=2, the function takes value 4
If you wanted to know the probability of getting no heads, if X="number of heads" is your random variable, you substitute X=0 on the appropriate mass function for this kind of problem
lector57 t1_j2aim3d wrote
Reply to ELI5: 1.5 liters of softdrink (coca cola) 1.5 kg as well? by kz21n
Short explanation: liter is a measure of volume, the amount of space filled
I Lt of mercury weighs much more than 1 Lt of water even though they occupy same amount of space.
1 lt of water, for example, weighs more than 1 lt of cooking oil.
Conversely... 1 Kg of water occupies LESS space than 1 Kg of cooking oil but 1 Kg of mercury occupies much less space than 1 Kg of water.
ELI5