Variance and standard deviation

Student A received the following course grades during her first year of college: 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 0. Student B received the following grades during her first year of college: 4, 4, 4, 4, 4, 4, 3, 1, 1, 1. (a) Write down the relative frequency distribution tables for each student, and compute the population mea ...continues

Determine probability

An archer has probability .3 of hitting a certain target. What is the probability of hitting the target exactly two times in four attempts?

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 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