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prohojiy [21]
2 years ago
13

The mean shoe size of the students in a math class is 7. 5. Most of the shoe sizes fall within 1 standard deviation, or between

a size 6 and a size 9. What is the standard deviation of the shoe size data for the math class? 1. 5 2. 7 3. 0 3. 8.
Mathematics
1 answer:
lana [24]2 years ago
4 0

Answer: 1.5

Step-by-step explanation:Let the standard deviation of the shoe size be represented by ' ' and the mean shoe size be represented by ' = 7.5'. Also, the sizes of the shoe be represented by ' '. So, . Hence, the standard deviation of the shoe size data for the math class is 1.5.

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A train travels 25 miles in 20 minutes. What is the train speed in miles per hour?
kenny6666 [7]
60 min = 1 hour

1st we need to know how many times 20 goes in 60 so we will divide.

60 ÷ 20 = 3

Now we will multiply to find the trains speed in miles per hour. 

3 × 25 = 75

SO, the train travels 75 miles per hour. 

Hope I helped ya!! 
4 0
2 years ago
The original price of a coat is $90. It is on sale for 20% off. How much will you pay if you buy the cost during the sale?
ziro4ka [17]

Answer:

72$

Step-by-step explanation

How to insert in a calculator 90-20%= 72

How to take 20% from a price

Divide the original price by 5. <em>18</em>

Subtract this new number from the original one. <em>90 - 18 </em>

The number you calculated is the discounted value. <em>90 - 18 = </em><u><em>72</em></u>

6 0
3 years ago
Read 2 more answers
What is the following shows the factors of 5x^2+17x+6
ElenaW [278]

<span><span>(5x+2)</span><span>(x+3)</span></span>

Explanation:

Find factors of <span>5and 6</span> whose products ADD to 17

It might take a bit of trial and error to find the correct combination of factors.

<span><span>........</span>5 and 6</span>
<span><span>.......</span>↓ ↓</span>
<span><span>........</span>5 2 →1×2=2</span>
<span><span>........</span>1 3 →5×3=<span>15<span>−−</span></span></span>
<span><span>...............................................</span><span>17</span></span>

6 0
3 years ago
Read 2 more answers
If you subtract 38431 from a number, you are left with 14391.Find the number
Yakvenalex [24]

Answer:

52822

Step-by-step explanation:

38431+14391= 52822

Hope this helps! :)

5 0
3 years ago
Read 2 more answers
A
kykrilka [37]

Answer:

One possible answer would be they sold 80 student tickets and 30 adult tickets

Step-by-step explanation:

set up two inequalities, one to show number of tickets that can be sold, and the other is how much money they need to make

5x+10y G than or =  700

x+y L than or = 110

The first inequality shows that each student (x) ticket sells for $5, and each adult (y) ticket sells for $10, and the amound has to be greater or equal to 700.

The second inequality shows that both student and adult tickets sold have to be less than or equal to 110.

First find either x or y, in this case finding y was easier

y is g than or = to 30

This means that they sold at least 30 adult tickets= $300

With y, plug into the inequality x+y L than or = to 110 to find x

x is less than or = to 80

This means that they sold at most 80 student tickets = $400

Hope this helps!

8 0
2 years ago
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