William Curry
2021-12-14
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asked 2021-02-21

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

Express your answer in the form of three inequalities. Give your answers in decimal fractions up to three places

asked 2021-03-18

A population of values has a normal distribution with

Find the probability that a single randomly selected value is between 133.6 and 134.1.

Write your answers as numbers accurate to 4 decimal places.

asked 2020-11-05

A population of values has a normal distribution with

Find the probability that a single randomly selected value is less than 130.9.

Write your answers as numbers accurate to 4 decimal places.

asked 2020-10-25

A normal population has mean $\mu =20$ and standard deviation $\sigma =4$ .

What proportion of the population is less than 18?

What proportion of the population is less than 18?

asked 2021-01-05

If X and Y are random variables and c is any constant, show that $E(X-Y)=E(X)-E(Y)$ .

asked 2021-06-01

The continuous random variables X and Y are statistically independent and have marginal density functions ${f}_{X}(x)=2x,0\le x\le 1,{f}_{Y}(y)=\frac{1}{{y}^{2}},y\ge 1$ .

Calculate the probability$P(X\le 0.5,Y\le 2)=$ ?

Calculate the probability

asked 2022-01-28

For mean 25 and standard deviation 3, how much area is under the bell shaped curve within 2 standard deviations of the mean?