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SOVA2 [1]
2 years ago
9

N general 20% of all students are left handed. a class of size 20 meets in a room with 5 left handed and 18 right handed chairs.

find the probability that each student will have a chair to their needs?
Mathematics
2 answers:
beks73 [17]2 years ago
8 0
All students will have a chair to their needs. So a 100% probability.
qaws [65]2 years ago
8 0

Answer:

The probability that each student will have a chair to their needs is P=0.6698.

Step-by-step explanation:

If 20 % of all students are left handed (LHS) and the class size is 20, there will be 4 left handed students and 16 right handed or ambidextrous (RHS). Then there are 5 left handed chairs (LHC) and 18 right handed (RHC), so there are 23 chairs. Now, you have to estimate the proportion for LHS, RHS, LHC and RHC.

P(LHS) = 4/20 ⇒ 0.2.

P(RHS) = 16/20 = 0.8.

P(LHC) = 5/23 = 0.217.

P(RHC) = 18/23 = 0.783.

Then to find the probability that each student will have a chair to their needs, we have to multiply P(LHS)xP(LHC) and P(RHS)xP(RHC) and sum.

⇒P(LHS)xP(LHC) + P(RHS)xP(RHC) = (0.2 x 0.217) + (0.8 x 0.783)

⇒ P(LHS)xP(LHC) + P(RHS)xP(RHC) = 0.6698.

Summarizing, the probability that each student will have a chair to their needs, is 0.6698.

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What angle does an arc 6.6cm in length subtends at the centre of a circle of radius 14cm. Use π = 22/7)
aniked [119]

Answer:

STEP 1: Find the circumference:

Circumference = 2πr

Circumference = 2π(14) = 28π cm

............................................................................................

STEP 2: Find the length of the arc:

Length of the arc = 36/360 x 28π

Length of the arc = 8.8 cm

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Answer: The length of the arc is 8.8 cm

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hope it helpssss

Mark it as brilliant answer plzzz

ФωФ

4 0
2 years ago
Read 2 more answers
PLEASE HELP ME!
algol13

Step-by-step explanation:

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The simplest method is "brute force".  Calculate each term and add them up.

∑ = 3(1) + 3(2) + 3(3) + 3(4) + 3(5)

∑ = 3 + 6 + 9 + 12 + 15

∑ = 45

2.\sum_{k=1}^{4}(2k)^{2}

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This is a geometric sequence where the first term is 1 and the common ratio is 1/4.  The nth term is:

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So the series is:

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This is an arithmetic sequence where the first term is -5 and the common difference is 4.  The nth term is:

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5 0
2 years ago
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KATRIN_1 [288]

Answer:

A, (1, 3+1/2)

Step-by-step explanation:

Midpoint formula for reference: m= {(x1 + x2)/2, (y1 + y2)/2}

Plugging in the points we get: m= {(8 - 6)/2, (5 + 2)/2}

Now we simplify using PEMDAS. First step is parentheses.

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Simplifying again (and making 7/2 a mixed number), it becomes

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3 0
1 year ago
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bagirrra123 [75]

You didn't say if the car bought is the new car or the old car so I'm assuming the car bought for $22,500 is the new car.

You divide 22,500 by 2 to get the cost of the old car. When you do this, you find out the old car costed $11,250.

the equation is 22,500/2=p


If $22,500 is the cost of the old car, then it's not my fault that the poster did not make it clear. If the previous car costed $22,500, then the previous car costed $22,500



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coldgirl [10]
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