What is the mean, median, and mode of the numbers

We wish to estimate what percent of adult residents in a certain county are parents. Out of 600 adult residents sampled, 192 had kids. Based on this, plot a $99\mathrm{\%}$ confidence interval for the proportion of adult residents who are parents in a given county.
Express your answer in the form of three inequalities. Give your answers in decimal fractions up to three places ${\displaystyle <p<}$ Express the same answer using a point estimate and a margin of error. Give your answers as decimals, to three places.
${\displaystyle p=\pm }$

A population of values has a normal distribution with ${\displaystyle \mu =133.5}$ and ${\displaystyle \sigma =5.2}$. You intend to draw a random sample of size ${\displaystyle n=230}$.
Find the probability that a single randomly selected value is between 133.6 and 134.1.
${\displaystyle P\left(133.6<X<134.1\right)=}$?
Write your answers as numbers accurate to 4 decimal places.

If you add two independent random variables, what is the standard deviation of the combined distribution, if the standard deviations of the two original distributions were, for example, 7 and 5?

You roll three dice, and you define the random variable X as the number of heads obtained. What are all possible values of the random variable X?

Two random variables X and Y with joint density function given by:
$f(x,y)=\{\begin{array}{ll}\frac{1}{3}(2x+4y)& 0\le x,\le 1\\ 0& elsewhere\end{array}$
Find ${\displaystyle P\left(x<\frac{1}{3}\right)}$

Suppose that X and Y are continuous random variables with joint pdf $f(x,y)=e^{-(x+y)}0$ and zero otherwise.
Find $P(X>Y)$

Can you find the standard deviation of negative numbers?