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The density function of a random variable X is given by f(x)= 1/(7√2π) e^(-?(x+3.6)?^2/98)   Find its (a) math expectation (b) variance and (c) distribution funct...

The distribution of the width of a standard piece of computer paper is normal with an expectation of 8.5 inches and the standard deviation of 0.2 inch.   a) Find the probability that...

A random variable X is distributed normally with E(X) = 8 and σ(X) =3 . Find P(9≤X<11).

Let X be given by its distribution function F(x), such that F(x) = 0 if x ≤ 0 F(x) = x^2/4 if 0<x≤2 F(x) =1 if x>2   a)Graph the distribution function F(x) b)Graph...

Find E (x),Var(x) , Ó(x)  if a random variable X is given by its density function f(x) , such that  f(x)=0, if x≤0 f(x)=3/8 x^2, if 0<x≤2 f(x)=0, if x>...

want to convert 5% of one hundred thousand into dollar amount

I have 1277 calls that are 2 minutes each, and I pay \$191.55, what is my cost per minute?

At the town fair, you can pay \$5 to toss a ring at a set of bottles. If you get a “ringer” on the small mouth bottle, you win \$35. If you get a “ringer” on the medium bottle, you win \$10. If you get...

X_1,X_2,… X_121 are independent and identically distributed random variables such that E(X_i )=3 and Var (X_i )=25. What is the standard deviation of their average? In other words, what is the...

The vertex is

Which statement is true? A line parallel to the x-axis has neither slope nor y-intercept defined. A line parallel to the y-axis has neither slope nor y-intercept defined. A line parallel...

(x-4)2 (x-9) I have to put this polynomial in standard form :) Help please

I have to solve this system:   3x+y+z=13 2x+2y-3z=3 3x+y-z=7

height is 482ft square base is 755ft

How much should Jethro invest now to have \$10 000 in 3 years time? The money will be invested at 5%/ a compounded monthly.

If \$350 grows to \$500 in 3 years, what is the annual interest rate assuming that interest in compounded annually?

Mario neglected to pay a credit card bill of \$1550 at 17%/a, compounded daily, for 2 weeks after it was due. What is the amount he must pay to settle the bill at the end of 2 weeks?

Gordon has a Canada Savings Bond that pays \$150 in simple interest each year. The annual interest rate is 4.75%. What principal did Gordon invest in the bond?

an investment of \$1500 earned \$35.20 at a simple-interest rate of 5.5% per year. How long was the investment held?