Based on long years of experience, an instructor in the principles of economics has determined that in her class the probability distribution of X, the number of students absent on Mondays, is as follows:

col1 X: 0 1 2 3 4 5 6 7
col2 F(x)0.005 0.025 0.310 0.340 0.220 0.080 0.019 0.001

(a) Sketch a probability function of X
(b) Find the probability that on a given Monday either two or three or four students will be absent
(c) Find the probability that on a given Monday more than three students are absent
(d) Compute the expected value of the random variable X. Interpret this expected value.
(e) Compute the variance and standard deviation of the random variable X
(f) Compute the expected value and variance of Y=7X+3

answer:

total cost for tiles and paints is $924.  

step-by-step explanation:

we have been given that a community hall is in the shape of a cuboid. the hall is 40m long 15m high and 3m wide.

the paint will be required for 4 walls and ceiling.

let us find area of walls and ceiling.

therefore, the area of walls and ceiling is 1410 square meters.

given: cost for 10 litre of paint is $10 and 10 litre paint covers 25 square meter. therefore,

therefore, the total painting cost is $564.

tiles will be required for floor. let us find the area of floor.

given: 1m squared floor tiles costs $3. so,

therefore, the total tiles cost is $360.

now let us find combined total cost of tiles and paint.

therefore, the combined total cost of tiles and paint is $924.

step-by-step explanation:

why? because i noticed a pattern. 60 120. those numbers without the zero, make the 6 times tables leaving your answer to be b since 6 times 4 is 24 and adding a zero making it 240.