what is the distribution of $a$ what is the distribution of $a$? which random variable is independent and identical to $a$ what is the distribution for $b$ what is the distribution of p in $ arctan what type of random variable is $a$ what is the cdf for $a$ what is the distribution of $a$ if $a and $b$ are two identical random variables, what is the distribution is $b a regular variable what is the distribution of $a$ and $b$ which random variable is the best for the distribution how do you tell if $a$ and $b$ are identically distributed random variable if $a$ is a normal random variable, what is the distribution what is the distribution of $a$ and $b$ which is the normal random variable? what is the distribution of $a$ what is the distribution of $a$ and $b$ if a variable is independent, what is distribution? what is normal distribution for cdf