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andreev551 [17]
3 years ago
11

Need help with number 15 please help

Mathematics
1 answer:
Viktor [21]3 years ago
8 0
A. 80 students
B. 12 students
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The probability that a student uses Smarthinking Online Tutoring on a regular basis is 0.31 . In a group of 21 students, what is
Ivenika [448]

Answer: 0.0241

Step-by-step explanation:

This is solved using the probability distribution formula for random variables where the combination formula for selection is used to determine the probability of these random variables occurring. This formula is denoted by:

P(X=r) = nCr × p^r × q^n-r

Where:

n = number of sampled variable which in this case = 21

r = variable outcome being determined which in this case = 5

p = probability of success of the variable which in this case = 0.31

q= 1- p = 1 - 0.31 = 0.69

P(X=5) = 21C5 × 0.31^5 × 0.69^16

P(X=5) = 0.0241

4 0
3 years ago
Write the next three terms of the following sequence 4,5,7,10,14
Law Incorporation [45]
4,5,7,10,14=19,25, 32
8 0
3 years ago
Robert borrowed $750 from his parents. He promised to repay the loan by giving his parents at least $67 from his paycheck each w
Luda [366]

To answer this question we can propose the following equation:


d=750 -x(67)


Where:


x is the number of weeks elapsed.


d is the debt depending on the weeks.



Robert promised to pay at least $ 67 each week.


Therefore, after 5 weeks the debt of rober should be:


d\leq750-5*67

d\leq415


Then scenario A) is possible because 150.



After 6 weeks:


d\leq750-6*67


d\leq348

Then scenario B) is possible because 200.



After 7 weeks


d\leq750-7*67


d\leq281

Then scenario C) is possible because 250.



After 8 weeks

d\leq750-8*67

d\leq214

So scenario D) is NOT possible because 300>214



Finally the correct answer is option D.

3 0
2 years ago
6/5(5-4x)=-18 solve for X​
tatiyna

Answer:

it's your answer......

5 0
3 years ago
Shown is the graph for which of the following equations?
katrin2010 [14]
Since the graph is moving positive from left to right, x is positive. so now we are left with B) and C) for our answer

now, the y intercept or b is -3 as shown in the graph

the answer is C) y= x -3
8 0
3 years ago
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