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nikdorinn [45]
2 years ago
13

In a class of 888, there are 333 students who have done their homework. If the teacher chooses 222 students, what is the probabi

lity that both of them have done their homework?
Mathematics
2 answers:
vlabodo [156]2 years ago
8 0
555 of the students haven’t did there work
TEA [102]2 years ago
7 0

Answer:

3/28

Step-by-step explanation:

3/8 * 2/7 = 6/56 = 3/28

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How do you know if this equation is true 1/3+1/5=2/8=1/4
raketka [301]
4/16 or 1/4 because 1 + 1 + 2 is 4 & 3 + 5 + 8 is 16 so the fraction will be 4/16 but u can also divide both by 4’s which is 1/4.
7 0
3 years ago
A researcher at a large company has collected data on both the beginning salary and the current salary of 48 randomly selected e
Nadya [2.5K]

Answer:

a. 0.83

b. 44107.3

c. 2252.7

Step-by-step explanation:

a)

The correlation coefficient is calculated as

byx=rSy/Sx

rSy=byx*Sx

⇒r=byx*Sx/Sy

Sy=standard deviation of y=standard deviation of current salary=15300

Sx=standard deviation of x=standard deviation of beginning salary=5970

byx=2.12

r=2.12*5970/15300

r=12656.4/15300

r=0.83

There is a strong positive correlation between current and beginning salary.

b)

Beginning salary=$22000

As

y^ =−2532.7 + 2.12x.

Current salary=-2532.7+2.12*beginning salary

Current salary=-2532.7+2.12*22000

Current salary=-2532.7+46640

Current salary=$44107.3

The predicted current salary of Mr. Joseph Keller is $44107.3.

c)

Residual=y-y^=Observed-Predicted

Observed Current Salary of Kathy Jones=40000

Beginning salary of Kathy Jones=19000

y^ =−2532.7 + 2.12x.

Predicted Current salary=-2532.7+2.12*beginning salary

Predicted Current salary=-2532.7+2.12*19000

Predicted Current salary=-2532.7+40280

Predicted Current salary=$37747.3

Residual=Observed Current Salary-Predicted Current salary

Residual=40000-27747.3

Residual=$2252.7

The residual for Ms. Jones is $2252.7.

8 0
3 years ago
Solve for x.<br> 6 - 4x = -22
Kitty [74]

Answer:

x = 7

Step-by-step explanation:

6 - 4x = -22

-6          - 6

-4x = -28

x = -28/-4

x = 7

8 0
3 years ago
50 PTS MANY POINTS
kari74 [83]

Answer:

B. 1,900

Step-by-step explanation:

3 0
3 years ago
Fill in the missing numbers in this table NEED ASAP PLEASE ANYONE
Rashid [163]

Answer:

Step-by-step explanation:

add all divide by to total no.of value

64/4=16

mean=16

4 0
2 years ago
Read 2 more answers
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