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KATRIN_1 [288]
3 years ago
8

Choose the expression that best represents the phrase below. ...12 less than the number of apples... A. 12 a B. a 12 C. 12a D. 1

2 + a E. a - 12 F. 12 - a
Mathematics
2 answers:
Ne4ueva [31]3 years ago
8 0

Answer:

E I think. If you have 24 apples, and you need to find out 12 less than the number of apples you have total, you could replace A with 24 and do 24-12=12 to find out that you have 12 apples.

Hope this helped!

Stay safe

vodomira [7]3 years ago
6 0

Answer:

the # of apples - 12

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On a road trip, a family drove 60 miles per hour for their entire trip. Which of the following rates could they have been drivin
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3 years ago
It is known that 25% of inhabitants of a community favour a political party A.
Keith_Richards [23]

Answer:

i) P(X=2)=(20C2)(0.25)^2 (1-0.25)^{20-2}=0.0669

ii) P(X=0)=(20C0)(0.25)^0 (1-0.25)^{20-0}=0.00317

P(X=1)=(20C1)(0.25)^1 (1-0.25)^{20-1}=0.0211

P(X=2)=(20C2)(0.25)^2 (1-0.25)^{20-2}=0.0669

And replacing we got:

P(X \geq 3) = 1- [0.00317+0.0211+0.0669]= 0.90883

iii) P(X

Step-by-step explanation:

Let X the random variable of interest "number of inhabitants of a community favour a political party', on this case we now that:

X \sim Binom(n=20, p=0.25)

The probability mass function for the Binomial distribution is given as:

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

Where (nCx) means combinatory and it's given by this formula:

nCx=\frac{n!}{(n-x)! x!}

Part i

We want this probability:

P(X=2)=(20C2)(0.25)^2 (1-0.25)^{20-2}=0.0669

Part ii

We want this probability:

P(X\geq 3)

And we can use the complement rule and we have:

P(X\geq 3) = 1-P(X

And if we find the individual probabilites we got:

P(X=0)=(20C0)(0.25)^0 (1-0.25)^{20-0}=0.00317

P(X=1)=(20C1)(0.25)^1 (1-0.25)^{20-1}=0.0211

P(X=2)=(20C2)(0.25)^2 (1-0.25)^{20-2}=0.0669

And replacing we got:

P(X \geq 3) = 1- [0.00317+0.0211+0.0669]= 0.90883

Part iii

We want this probability:

P(X

And replacing we got:

P(X

6 0
3 years ago
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