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madreJ [45]
3 years ago
6

1000 test scores are approximately normally distributed with a mean of 60 and a standard deviation of 8, if a grade of B is assi

gned to the scores between 68 and 76, how many scores will receive a grade of B?.
Mathematics
1 answer:
DIA [1.3K]3 years ago
8 0

Answer:

c

Step-by-step explanation:

I took the test

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The table represents an exponential function.
Tpy6a [65]
TL;DR(too long didn't read): answer is 3/4


This question may look confusing, however, it is more easily understood once you see that the fractions appear to be changing more randomly than they are in a way you can recognize, however, they're not. Since they look like that it's because they're being multiplied by a fraction. Split the fractions into two to make it easier. 3/2 and 9/8, just look at them as '3' and '2' and '9' and '8'. 3 becomes 9. Which means either 6 was added or 3 was multiplied by 3. Compare to the next row, 27. 9-->27 can't be 6, so it's being multiplied by 3. Now for the bottom. 2 becomes 8, and knowing that the numerator of the fraction is being multiplied, so is the denominator then, so 2-->8 is 2 times 4. Put the numerator and denominator back together and you have 3/4. The answer is 3/4.
3 0
3 years ago
Read 2 more answers
Simplify the expression 12^-3 * 12^10 * 12^0
Misha Larkins [42]

12^-3 * 12^10 * 12^0

= 12^(-3 + 10 + 0)

= 12^7

6 0
3 years ago
Read 2 more answers
Find m< AFE and include working out.
andreyandreev [35.5K]

Answer:

∠ AFE = 80°

Step-by-step explanation:

Since BD is a straight line , then

∠ AFB + ∠ AFE + ∠ EFD = 180°, that is

50° + ∠ AFE + 50° = 180°

100° + ∠ AFE = 180° ( subtract 100° from both sides )

∠ AFE = 80°

3 0
3 years ago
Determine the distance between -7 and 7.
umka21 [38]
It is D) 14 Units because it takes seven units to get from -7 to zero and 7 units to get from 0 to 7. there fore 7+7=14.
6 0
3 years ago
(-7 -3) (-3, 5) write an equation of a line that passes through each pair of points
eduard

Answer:

y = 2x + 11

Step-by-step explanation:

The equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

Calculate m using the slope formula

m = (y₂ - y₁ ) / (x₂ - x₁ )

with (x₁, y₁ ) = (- 7, - 3) and (x₂, y₂ ) = (- 3, 5)

m = \frac{5+3}{-3+7} = \frac{8}{4} = 2, thus

y = 2x + c ← is the partial equation

To find c substitute either of the 2 points into the partial equation.

Using (- 3, 5 ), then

5 = - 6 + c ⇒ c = 5 + 6 = 11

y = 2x + 11 ← equation of line

7 0
3 years ago
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