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andrezito [222]

2 years ago

10

There are 12 boys and 8 girls in a class, including a brother and a sister. If one boy and one girl are selected at random from

the boys and girls respectively , what is the probability that the brother and sister are both selected?
kindly write the procedure

1 answer:

kupik [55]2 years ago

7 0

I think the answer is 1/10.

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in a certain normal distribution, 6.3% of the area lies to the left of 36 and 6.3% of the area lies to the right of 42. Find the

KATRIN_1 [288]

As the normal distribution is symmetric the mean is (36 + 42) / 2 = 39

p(X < 42) = 1 - 0.063 = 0.937

From tables Φ (1.53) = 0.9370

From this time:

42 is 1.53 standard deviations above the mean

42 = 39 + 1.53s

1.53s = 3

Standard deviation is = 1.96

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79%

Step-by-step explanation:

To find the median, you need to arrange the numbers in ascending order. Than pick the middle number. If there are two middle numbers then you add them together and then divide by 2.

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2 years ago

For a $60 coat there is an additional 10% charge when the coat is bought on credit. What is the total cost to a credit customer?

Whitepunk [10]

Answer:

I think 60 times .10 is 600

Step-by-step explanation:

60 times .10= number

number+60

4 0

2 years ago

Read 2 more answers

For customers purchasing a refrigerator at a certain appliance store, let A be the event that the refrigerator was manufactured

kati45 [8]

The answers are the following:
<span><span><span>P(A)=0.75</span><span>
</span></span><span><span>P(B|A)=0.9
</span></span><span><span>P(B|<span>A′</span>)=0.8
</span></span><span><span>P(C|A∩B)=0.8
</span></span><span><span>P(C|A∩<span>B′</span>)=0.6
</span></span><span><span>P(C|<span>A′</span>∩B)=0.7
</span></span><span><span>P(C|<span>A′</span>∩<span>B′</span>)=0.3</span></span></span>

4 0

2 years ago

At a particular restaurant, each mini hotdog has 80 calories and each pizza roll has 50 calories. A combination meal with mini h

cestrela7 [59]

There are 15 mini hotdogs and 5 mini pizza rolls in the combination meal.

Step-by-step explanation:

Given,

Calories in each hotdog = 80 calories

Calories in each mini pizza = 50 calories

Combined meal = 20

Combined calories = 1450 calories

Let,

x represent the number of hot dogs.

y represent the number of mini pizzas.

According to given statement;

x+y=20 Eqn 1

80x+50y=1450 Eqn 2

Multiplying Eqn 1 by 80

$80(x+y=20)\\80x+80y=1600\ \ \ Eqn\ 3$

Subtracting Eqn 2 from Eqn 3

$(80x+80y)-(80x+50y)=1600-1450\\80x+80y-80x-50y=150\\30y=150$

Dividing both sides by 30

$\frac{30y}{30}=\frac{150}{30}\\y=5$

Putting y=5 in Eqn 1

$x+5=20\\x=20-5\\x=15$

There are 15 mini hotdogs and 5 mini pizza rolls in the combination meal.

Keywords: linear equation, elimination method

Learn more about elimination method at:

#LearnwithBrainly

7 0

2 years ago