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melomori [17]
2 years ago
15

HALLPPPPPP PLEASEEE!!

Mathematics
1 answer:
vazorg [7]2 years ago
5 0
I think right scalene
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In an Algebra II class with 135 students, the final exam scores have a mean of 72.3 and standard deviation 6.5. The exams on the
gregori [183]
Population = 135 students
Mean score = 72.3
Standard deviation of the scores = 6.5

Part (a): Students from 2SD and 3SD above the mean
2SD below and above the mean includes 95% of the population while 3SD includes 99.7% of the population.
95% of population = 0.95*135 ≈ 129 students
99.7% of population = 0.997*135 ≈ 135 students

Therefore, number of students from 2SD to 3SD above and below the bean = 135 - 129 = 6 students.
In this regard, Students between 2SD and 3SD above the mean = 6/2 = 3 students

Part (b): Students who scored between 65.8 and 72.3
The first step is to calculate Z values
That is,
Z = (mean-X)/SD
Z at 65.8 = (72.3-65.8)/6.5 = 1
Z at 72.3 = (72.3-72.3)/6.5 = 0
Second step is to find the percentages at the Z values from Z table.
That is,
Percentage of population at Z(65.8) = 0.8413 = 84.13%
Percentage of population at (Z(72.3) = 0.5 = 50%
Third step is to calculate number of students at each percentage.
That is,
At 84.13%, number of students = 0.8413*135 ≈ 114
At 50%, number of students = 0.5*135 ≈ 68

Therefore, students who scored between 65.8 and 72.3 = 114-68 = 46 students
4 0
3 years ago
Although five of John's answers were incorrect, 90% of his answers were correct. How many questions did John answer in all?
fiasKO [112]

Answer:

John answered 50 questions.

Step-by-step explanation:

Although five of John's answers were incorrect, 90% of his answers were correct.

This means that 5 is 100 - 90% = 10% of the total number of questions, n. So

0.1n = 5

n = \frac{5}{0.1}

n = 50

John answered 50 questions.

7 0
2 years ago
60 is x% of 12. Find the value of x.
Liula [17]

Answer:

20

Step-by-step explanation:

We can set up a percentage proportion to find the value of x.

\frac{12}{x} = \frac{60}{100}

Now we cross multiply:

100\cdot12=1200\\\\1200\div60=20

Hope this helped!

4 0
3 years ago
Solve for b.<br> 15 - 3b=63
kirill115 [55]
15-3b=63
subtract 15 from both sides
-3b=48
divide -3 from both sides
b= -16
5 0
3 years ago
Read 2 more answers
Vinny decorated 72 cookies and 36 minutes how many cookies did you decorate per minute
SCORPION-xisa [38]
2 cookies. 72/36= 2 cookies per minute. 
6 0
3 years ago
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