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3 years ago

Find the probability that a student earns a grade D or F

Mathematics

2 answers:

Marat540 [252]3 years ago

8 0

Answer:

P=.14 or 1/7

Step-by-step explanation:

P(d)=3/35

P(f)=2/35

P( D or F) = 3/35 + 2/35=

1/7 or .14

kkurt [141]3 years ago

5 0

Answer: P = 1/7

Explanation:
There 35 students total and there are 3 students with grade D and 2 students with Grade F

3/35 + 2/35 = 5/35 = 1/7

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Nadusha1986 [10]

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3 years ago

One option in a roulette game is to bet $12 on red. (There are 18 red compartments, 18 black compartments, and two compartmen

Alona [7]

Answer:

The expected value is -$0,63

Step-by-step explanation:

The expected value of a discrete variable x is given by:

E(x)=x1*p(x1)+x2*p(x2)+...+xn*p(xn)

Where x1, x2, .. xn are the posibles results that the variable x can take and p(x1), p(x2),...,P(xn) are their respective probabilities.

In this case, we have two possible results if we bet $12 on red. This results are:

1. The balls lands on red: in this case we keep the $12 we paid and we awarded 12. That means, we gain $12 and the probability of this case is the division of the number of red compartments by total number of compartments. So:

x1=$12

p(x1)=18/38

2. The balls doesn't land on red: in this case we lose the $12 that we bet and the probability is the division of number of compartments that aren't red by the total number of compartments. So:

x2=-$12

p(x2)=20/38

Then, replacing x1, x2, p(x1) and p(x2) on the equation of the expected value, we get:

E(x)=($12)*(18/38) + (-$12)*(20/38)

E(x)=$-0.63

So, the expected value if we bet $12 on red is to lose $0.63

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4 years ago

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4 years ago

Find the volume of a cylinder that has a height of 8 inches and a diameter of 14 inches.

mariarad [96]

Answer:

$V=1232\ inches^3$

Step-by-step explanation:

Given that,

The height of a cylinder, h = 8 inches

The diameter of the cylinder, d = 14 inches

Radius, r = 7 inches

We need to find the volume of the cylinder. The formula for the volume of a cylinder is given by :

$V=\pi r^2 h\\\\=\dfrac{22}{7}\times 7^2\times 8\\\\V=1232\ inches^3$

So, the volume of the cylinder is equal to $1232\ inches^3$ .

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3 years ago

Operations with fractions Please help !!!!! questions attached

Bogdan [553]

Answer:

1) 23/20

2) 14/5

3) 47/14

4)27/56

5) 10/7

6) 23/14

Step-by-step explanation:

We will apply the Least Common Multiple (LCM). because, each exercise has fractions without a common a denominator

$\frac{3}{4} +\frac{2}{5} = \frac{15+8}{20} =\frac{23}{20}\\\\1 +\frac{9}{5} = \frac{5+9}{5} =\frac{14}{5}\\\\\frac{13}{7} +\frac{3}{2} = \frac{26+21}{14} =\frac{47}{14}\\\\\frac{5}{8} -\frac{1}{7} = \frac{35-8}{56} =\frac{27}{56}\\\\1 +\frac{3}{7} = \frac{7+3}{7} =\frac{10}{7}\\\\\frac{1}{7} +\frac{3}{2} = \frac{2+21}{14} =\frac{23}{14}$

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3 years ago