Answer:
E) 166
Step-by-step explanation:
Standard deviation is 10
Margin error for the problem is 2
Probability 99%, that means thet the siginficance level α is 1 – p
α = 1 – 0.99 = 0.01
margin of error (ME) can be defined as follows
ME = Z(α/2) * standard deviation/ √n
Where n is the sample size
Z(0.01/2) = Z(0.005)
Using a z table Z = 2.576
Now, replacing in the equation and find n
2 = 2.576 * 10/ √n
2 = 25.76 /√n
√n = 25.76 /2
√n = 12.88
n = 12.88^2
n = 165.89 ≈166
Answer:
Step-by-step explanation:
Hello : let A(-7,-7) B(-5,-3)
the slope is : (YB - YA)/(XB -XA)
(-3+7)/(-5+7) = 4/2
=2
an equation is : y=ax+b a is a slope
y = 2x +b
the line through point (-7,-7) : -7 = (2)(-7)+b
b = 7
the equation is : y =2x+7
Answer:
0.425
Step-by-step explanation:
40x2.5=100
17x2.5=42.5
So the fraction is 42.5/100 which is 0.425
Hi!
Question:
At the beginning of the school year, 396 students attended the first football game. Attendance at the next game was 505 students. Estimate the percent of increase.
Solution:
To find the percent increase you subtract and find the difference then divide the difference by the original number.
Original Number - 396
Difference: 505 - 396 = 109
Divide: 109 / 396 = 0.272525252525...
Multiply by 100: = 0.272525... x 100 = 27.2525...
Answer:
Ther percent increse was approximately 27.25%
Hope This Helps!
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