Determine probability, mean, and variance

An urn contains four red balls and four white balls. An experiment consists of selecting at random a sample of four balls and recording the number of red balls in the sample. Set up the probability distribution and compute its mean and variance.

Multiply Matrices

Multiply Matrix[4 -1] over [2 .5] by matrix [3] over [2]

multiply matrices

multiply matrix a by matrix b matrix a: row 1 = [0 1 2] row 2 = [-1 4 .5] row 3 = [1 3 0] matrix b: row 1 = [3 -1 5] row 2 = [0 2 2] row 3 = [4 -6 0]

Find the inverse of a matrix.

Matrix row 1 = [2 3] row 2 = [5 7] find the inverse of this matrix

find the inverse of a matrix

matrix row 1 = [1 .5] row 2 = [0 .5] find the inverse

Find the inverse of a matrix.

Matrix row 1 = [0 1] row 2 = [1 0] Find the inverse of the matrix.

Finance

Given below are the present value factors for $1.00 discounted at 8% for 1 to 5 periods. Each of the following items is based on 8% interest compounded annually from day of deposit to day of withdrawal. PERIODS PRESENT VALUE OF $1 DISCOUNTED AT 8% PER PERIOD 1 0.926 2 0.857 ...continues

Probability

An experimental test to detect a particular type of cancer indicates the presence of cancer in 90% of individuals known to have this type of cancer, and in 15% of individuals known to be cancer-free (false positive). One hundred individuals volunteer to take the test. Of the 100, 60 are known to have the cancer, and 40 are known ...continues

Probability

A jar contains 3 white marbles, 2 yellow marbles, 4 red marbles and 5 blue marbles. Two marbles are picked at random. What is the probability that (a) both are blue (b) exactly 1 is blue (c) at least 1 is blue

Probability

If E and F are events with P ( E U F ) = 5/8, P (E ∩ F = 1/3, and P (E) = ½, Find: (a) P(E) (E has a straight line over it) (b) P (F) (c) P (F) (F has a straight line over it) detail each answer: (a) ½ (b) 11/24 (c) 13/24