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malfutka [58]
2 years ago
14

the mean of normally distributed test scores is 80 and the standard division is 5. If there are 186 test scores in the data samp

le, how many of them were in the 75 to 80 range?

Mathematics
1 answer:
Marizza181 [45]2 years ago
5 0

Answer:

63

Step-by-step explanation:

score 75 is one standard dev below the mean ====>to the mean  encompasses approx 34% of scores

.34 * 186 = 63

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Samantha has a shelf that is 95 over 4 inches wide. How many books can Samantha arrange on the shelf if each book is 5 over 4 in
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Answer:

Option 1 - 19, because the number of books is 95 over 4 divided by 5 over 4

Step-by-step explanation:

Given : Samantha has a shelf that is 95 over 4 inches wide.

To find : How many books can Samantha arrange on the shelf if each book is 5 over 4 inches thick?

Solution :

The thickness of shelf = \frac{95}{4} inches

Each book thickness = \frac{5}{4} inches

Let the total number of books that could be arranged in the shelf be 'n'.

\text{Number\ of\ books\ arranged}=\dfrac{\text{Thickness\ of\ shelf}}{\text{Thickness\ of\ one\ book}}

Substitute the values,

n=\dfrac{\dfrac{95}{4}}{\dfrac{5}{4}}

n=\dfrac{95\times 4}{5\times 4}

n=\dfrac{95}{5}

n=19

Therefore, option 1 is correct.

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4 0
3 years ago
Kaelyn used 2
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Answer:

107.5

Step-by-step explanation:

4 0
3 years ago
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If a bag contains 18 red, 6 yellow, 24 blue, and 8 white balloons, what is the part-lo-whole ratio of white balloons to
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Answer:

1:6

Step-by-step explanation:

1:6

I hope this answer is correct

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3 years ago
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What would the graph of 10x + 7y < 49 look ?
navik [9.2K]

Answer: The graph is attached.

Step-by-step explanation:

1. Solve for y, as following:

10x+7y

2. The equation of the line in slope intercept form is:

y=mx+b

Where m is the slope and b is the y-intercept.

3. In this case the equation of the line is:

y=-\frac{10}{7}x+7

then:

m=-\frac{10}{7}\\\\b=7

4. Find the x-intercept. Make y=0. Then:

0=-\frac{10}{7}x+7\\\frac{10}{7}x=7\\x=4.9

5. Then, plot the line that passes through the points (0,7) and (4.9, 0).

6. The symbol of the inequality is < therefore, the line must be dashed and indicates that the region under the line must be shaded.

Then you obtain the graph attached.

8 0
3 years ago
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7. On Thursday, Kim purchased a medium iced caramel latte and a blueberry muffin for $5.18. Then, on Friday, Kim
sashaice [31]

Answer:

Cost of medium iced caramel latte = $3.59

Step-by-step explanation:

Assume;

Cost of medium iced caramel latte = x

Cost of blueberry muffin = y

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x + y = 5.18......eq1

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Eq1 × 3

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x = 3.59

Cost of medium iced caramel latte = $3.59

4 0
3 years ago
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