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nlexa [21]
3 years ago
10

Which of the following best describes the change in the mean when 1213 is

Mathematics
1 answer:
Rama09 [41]3 years ago
4 0

Answer:

A

Step-by-step explanation:

The mean is the sum of all the values divided by the number of values.

Mean = \frac{34+75+26+81+65+38+49}{7}=52.57

When 1213 is added to the data set, new mean is:

New Mean = \frac{34+75+26+81+65+38+49+1213}{8}=197.625

<u><em>Definitely</em></u>, the mean increases. Correct answer is A

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A box contains red marbles and green marbles. Sampling at random from the box five times with replacement, you have drawn a red
olasank [31]

Answer: The probability of drawing a red marble the sixth time is 1/2

Step-by-step explanation:

Here is the complete question:

A box contains 10 red marbles and 10 green marbles. Sampling at random from the box five times with replacement, you have drawn a red marble all five times. What is the probability of drawing a red marble the sixth time?

Explanation:

Since the sampling at random from the box containing the marbles is with replacement, that is, after picking a marble, it is replaced before picking another one, the probability of picking a red marble is the same for each sampling. Probability, P(A) is given by the ratio of the number of favourable outcome to the total number of favourable outcome.

From the question,

Number of favourable outcome = number of red marbles =10

Total number of favourable outcome = total number of marbles = 10+10= 20

Hence, probability of drawing a red marble P(R) = 10 ÷ 20

P(R) = 1/2

Since the probability of picking a red marble is the same for each sampling, the probability of picking a red marble the sixth time is 1/2

3 0
3 years ago
What would be the rate of change and the initial value
seraphim [82]
Rate of change = 2/1 and the initial value is -2. this can be expressed as y=2x-2. 
4 0
3 years ago
PLEASE HELP URGENT‼️‼️
Dima020 [189]

Part A

(3x)^2*x^4

(3x)*(3x)*x^4 .... expand out (3x)^2

(3*3)*(x*x*x^4)

9x^6

Answer:  9x^6

============================================

Part B

It appears that Tonya forgot to square the 3 term and had this as her steps

(3x)^2*x^4

3x^2*x^4

3x^(2*4)

3x^8

Which is incorrect as the answer in part A indicates.

Not only is the '3' part wrong, but also the exponent of 8. Instead of multiplying the exponents, she should have added them.

The rule is a^b*a^c = a^(b+c). In this case, a = x, b = 2 and c = 4.

So x^2*x^4 = x^(2+4) = x^6

3 0
3 years ago
What is 3/4 - (-2/3) as an improper fraction?
iragen [17]

Answer:

17/12

Step-by-step explanation:

See picture.

I wrote your poblem as an additoin problem because 2 negitive numbers would make it possitve.

Example:

1 - (-2) = 1 + 2

6 0
3 years ago
Divide the following polynomial by 3.c.<br> 27x²y – 15xy
dezoksy [38]

Answer:

9x^2y-5xy

Step-by-step explanation:

Split it up like this to make it easier to work with:

\frac{27x^2y}{3}-\frac{15xy}{3}

Since the only thing in the denominator of those fractions is a 3, we can only divide the 27 by 3, not the x or y terms.  Same thing with the second fraction.  27 divided by 3 is 9 and 15 divided by 3 is 5, so

9x^2y-5xy

is the solution.  It is not completely simplified, but that isn't what you asked for, so this should suffice as the answer.

5 0
3 years ago
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