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Find the probability that at least two 9’s appear (as a sum) in four tosses of a pair of dice

a. 512/7172
b. 818/3132
c. 417/6561
d. 215/5112

During a particular year, 70 percent of the common stocks listed on the Nigeria Stock Exchange increased in market value, while 30 percent were unchanged or declined in market value. At the beginning of the year a stock advisory service chose 10 stock issues as being eѕspecially recommended. If the 10 issues represent a random selection, what is the probability that at least eight issues increased in market value?

a. 0.3828
b. 0.1325
c. 0.3144
d. 0.1553
Q22.
Ella has these coins.
Jayden has these coins.
Ella takes one of her coins at random and gives it to Jayden.
Jayden adds it to his coins.
Then Jayden takes one of his coins at random and gives it to Ella.
What is the probability that Ella and Jayden now have the same amount of money as each
other?
You must show your working.
________________________________________________
Find the equation of the line which is parallel to the 2y+3x=3 and passes through the midpoint (-2,3) and (4,5)
There are 1.8*10^-13 red blood cells in the body. A blood cell has a lifespan of 120 days What percentage (correct to 2 significant figures) of our red blood cells are formed/destroyed every day?
Determine the gradient of a straight line passing through the point (1,6) and (-3,-3)
A line AB passes through the point P(3,-2) with gradient -1/2, determine the equation of the line CD through P perpendicular to AB.
A line AB passes through the point P(3,-2) with gradient -1/2, determine the equation of the line CD through P perpendicular to AB.
Find the equation of the normal to the curve y = x^3 - x^2 at point (1,1)
According to USA Today (March 18, 1997), of 4 million workers in the general workforce, 5.8% tested positive for drugs. Of those testing positive, 22.5% were cocaine users and 54.4% marijuana users.
(a) What is the probability that of 10 workers testing positive, 2 are cocaine users, 5 are marijuana users, and 3 are users of other drugs? (USE MATLAB )
(b) What is the probability that of 10 workers testing positive, all are marijuana users? (USE MATLAB)
(c) What is the probability that of 10 workers testing positive, none is a cocaine user?
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