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aev [14]
4 years ago
14

What is the expected value of X?

Mathematics
2 answers:
Soloha48 [4]4 years ago
7 0

Answer:

5.6

Step-by-step explanation:

fr fr

Luda [366]4 years ago
6 0

Answer:

6.2

Step-by-step explanation:

The expected value is the sum of the each value times its probability.

X = (3×0.2) + (4×0.1) + (5×0.25) + (7×0.05) + (9×0.4)

X = 0.6 + 0.4 + 1.25 + 0.35 + 3.6

X = 6.2

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Answer:

x+y=3

Assuming that the option 1 and 2 dont mean anything

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Kira drove 522 miles in 9 hours.<br> At the same rate, how many miles would she drive in 7 hours?
Ipatiy [6.2K]

GIven:522 miles in 9 hours.

So if we divide 522 by 9 we get that Kira drives 58 miles per hour.

Now in 7 hours Kira just drives 7 times that which means Kira drives.

58*7=406 miles

Hope this helped!

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3 years ago
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3 years ago
• Hari bought 25 kg of pure ghee at Rs 180 per kg and 25 kg vanaspati ghee of Rs.80 per kg. He mixed both types of ghee and sold
Basile [38]

Step-by-step explanation:

as given,

hari bought,

amount of pure ghee he bought = 25 kg

cost of pure ghee per kg = Rs. 180

so, cost of 25 kg of pure ghee = 180 × 25 = Rs 4,500

amount of vanaspati ghee = 25 kg

cost of per kg of vanaspati ghee = Rs. 80

so, cost of 25 kg of vanaspati ghee = 80 × 25 = Rs. 2,000

he mixed both the ghee and got ( 25 + 25 ) = 50 kg of mixed ghee.

he sold them in cost = Rs. 150 per kg

so, total SP of mixed ghee = 150 × 50 = Rs. 7,500

so,

total CP = ( 4500 + 2000 ) = Rs. 6,500

total SP = Rs. 7,500

so,

Profit = SP - CP

→ 7,500 - 6,500 = Rs. 1000

Profit / gain = ( gain × 100 / CP)

→ (1000 × 100 / 6,500 )

→ 1000/65 = 15.38 ( approx.)

therefore, it's a profit of 15.38%.

<em>hope</em><em> this</em><em> answer</em><em> helps</em><em> you</em><em> dear</em><em>!</em><em> </em><em>and </em><em>may </em><em>u</em><em> have</em><em> a</em><em> great</em><em> day</em><em> ahead</em><em>!</em><em> </em><em>take </em><em>care!</em>

8 0
3 years ago
Write the equation of the line perpendicular to the line y = -5/7x + 12/7 and containing the point (5,2). Write your answer in s
Nutka1998 [239]

Answer:

y = 7x/5 - 5

Step-by-step explanation:

m = 7/5

y - 2 = 7/5(x - 5)

y - 2 = 7x/5 - 7

y = 7x/5 - 5

8 0
3 years ago
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