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cestrela7 [59]
2 years ago
12

Twelve of the 20 students in Ms. Sarno’s homeroom are female. Each month, Ms. Sarno randomly selects a student to act as “teache

r’s helper.”
Which simulation best models the selection of female “teacher’s helpers” for January, February, March, and April?
A spinner, divided into 5 congruent sectors with three of the sectors representing female students, is spun 12 times.
A coin, with heads up representing female students, is flipped 4 times.
A bag of 15 marbles, with 9 marbles representing female students, has a marble drawn 4 times with replacement.
A number cube, with odd numbers representing female students, is rolled 12 times.
Mathematics
2 answers:
Jet001 [13]2 years ago
7 0

Answer:

the answerr is C

Step-by-step explanation:

Ksivusya [100]2 years ago
3 0

Answer:

C. A bag of 15 marbles , with 9 marbles representing female students, has a marble drawn 4 times with replacement

Step-by-step explanation:

i took the test and got it right ;)

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A shipment of 7 television sets contains 2 defective sets. A hotel makes a random purchase of 3 of the sets. If x is the number
serg [7]

Answer:

The probability distribution is

X    :        0              1                 2

f(X) :       2/7          4/7               1/7

Step-by-step explanation:

Let x is the number of defective sets purchased by the hotel.

Total number of television sets = 7

Total number of defective television sets = 2

Since there are 2 defective television sets and hotel purchase 3 sets, So, X=0,1,2.

If X=0,

P(X=0)=\frac{^5C_3}{^7C_3}=\frac{10}{35}=\frac{2}{7}

If X=1,

P(X=1)=\frac{^5C_2\cdot ^2C_1}{^7C_3}=\frac{10\cdot 2}{35}=\frac{4}{7}

If X=2,

P(X=2)=\frac{^5C_1\cdot ^2C_2}{^7C_3}=\frac{5\cdot 1}{35}=\frac{1}{7}

The probability distribution is

X    :        0              1                 2

f(X) :       2/7          4/7               1/7

The probability histogram is shown below.

3 0
2 years ago
The probability of a golden retriever catching a tennis ball in mid-air is 74%. Find the probability that a golden retriever cat
professor190 [17]

Answer:

Step-by-step explanation:

Given a large enough sample size the probability is 100%

If the question is "What is the probability of catching 3 tennis balls in three tosses in mid air. Sample size is 3

0.74³ = 0.405224 or about 41%

4 0
1 year ago
p.s 15 points Which best describes the solution to 4 minus 7? Because Negative 4 + (negative 7) is an equivalent expression, the
luda_lava [24]

Answer:

because 4 + (negative 7) is an equivalent expression, the answer is -3.

Step-by-step explanation:

4 + (-7) = -3

4 0
1 year ago
Monifer used substitution to solve this system of equations. Which equation could be the result of her first step? 3a +b=225 b=a
weeeeeb [17]
3a + a - 15 = 225 . your substituting b(a-15) into the first equation. <span />
6 0
2 years ago
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A graphing calculator displays 1.89 x 10^12 as 1.89e12. How do you think it would display 1.89 x 10^-12? What does the e stand f
Lerok [7]

What you need to know for this case is that the calculator is using the scientific notation in two different ways:

Way 1:

a * 10 ^ b

Way 2:

aeb

Where, in both cases:

a, b: they are real numbers.

Therefore, for the following number:

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We have an equivalent way is:

1.89e-12

Answer:

1.89e-12

The e refers to the exponent to which the base 10 is elevated.

4 0
2 years ago
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