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2 years ago

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The number of students in each of the seventh grade homerooms that volunteer in the office are shown in the table. use mental ma

th to find the total number of students who volunteered. expain office volunteer homeroom number of students A. 6 B. 5 C. 4 D. 8 please help me

1 answer:

natta225 [31]2 years ago

3 0

I need to see the table

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The probability of drawing a heart from a standard deck of cards is 0.25. You record the car do you draw and return the car befo

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Answer: C) 0.112

Step-by-step explanation:

In binomial distribution with parameters n (Total trails) and p (probability of getting success sin each trial) , the probability of getting success in x trials is given by :-

$P(X=x)=^nC_xp^x(1-p)^{n-x}$

Given : The probability of drawing a heart from a standard deck of cards is 0.25

Here , getting heart is the success.

Then p= 0.25

For n= 20

The probability that you will draw a heart seven times i.e. x= 7:

$P(X=7)=^{20}C_7(0.25)^7(1-0.25)^{20-7}$

$P(X=7)=\dfrac{20!}{7!(20-7)!}(0.25)^7(1-0.25)^{20-7}\ \ [\because\ ^nC_r=\dfrac{n!}{r!(n-r)!}]$

$=\dfrac{20\times19\times18\times17\times16\times15\times14\times13!}{7!13!}(0.25)^7(0.75)^{13}\\\\=77520(0.00006103515625)(0.0237572640181)\\\\=0.112406195476\approx0.112$

Hence, the probability that you will draw a heart seven times = 0.112

Thus , the correct answer is C) 0.112 .

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2 years ago

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maxonik [38]

Answer: A

Step-by-step explanation:

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For every 1 litre of water used to make a medicine, 269ml of sucrose and 61ml of saline solution are used. Express the amount of

Burka [1]

Answer:

Step-by-step explanation:

1 litre = 1000 ml

water : Sucrose : Saline = 1000 : 269 : 61

This is simplest form. We cannot reduce this as 61 is a prime number and 1000; 269 will not come in 61th table or

We can say 100 ; 269 ; 61 don't have common term

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3 years ago

-4( x – 4) = 8 – 4x <br><br> last one NEED help

Ilya [14]

16=8

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16=8 btw the equation would be false

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