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Semenov [28]
3 years ago
9

For questions 1 - 3, find the sum.

Mathematics
2 answers:
Natasha_Volkova [10]3 years ago
4 0

Answer:

Step-by-step explanation:

5 9/13=74/13      i add the whole into the fraction

74/13+74/13= 148/13= 11 5/13

choice C

Sati [7]3 years ago
3 0

Answer:

its 100% B

Step-by-step explanation:

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Which expressions are equivalent to 3 1/4 - (-1/2) select all that apply
Colt1911 [192]
3 \dfrac{1}{4} - ( -  \dfrac{1}{2} ) =  3 \dfrac{1}{4} +  \dfrac{1}{2}  =  3 \dfrac{1}{4} +  \dfrac{2}{4}  =   3 \dfrac{3}{4}
7 0
3 years ago
The drama club members at Millie's middle school are selling tickets to the school play. Millie wants to determine the average
lukranit [14]

Answer:

Every third member of the club in her physical educations class

Step-by-step explanation:

The reasoning behind this is because if Millie surveys her club members who are hosting the school play, she wouldn't be able to get an accurate average number of tickets sold because the club member have a bias in terms of purchasing the tickets as they run the club. Meanwhile the physical education class has a more random assessment because every third person in the class may or may not have an interest in the play the same way the club would.

3 0
3 years ago
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Solve
Strike441 [17]

Answer:

x=±\sqrt{15/2}

Step-by-step explanation:

8 0
3 years ago
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The mean IQ score of students in a particular calculus class is 110, with a standard deviation of 5. Use the Empirical Rule to f
Anika [276]

Answer:

2.5%

Step-by-step explanation:

If the data set has a bell-shaped distribution, then you can use 68-95-99.7, or Empirical, rule. With bell-shaped distributions, 68% of results lie within 1 standard deviation of the mean, 95% of results lie within 2 standard deviations, and 99.7% lie within 3 standard deviations.

Your mean is 110, and you have a standard deviation of 5. This means that 68% of all students fall between IQ scores of 105 (110 - 5) and 115 (110 + 5), one standard deviation from the mean. To get 95% of the students, you need to go one more standard deviation out, so then you have 100 (105 - 5) and 120 (115 + 5), two standard deviations from the mean. 99.7% of the students fall between 95 (100 - 5) and 125 (120 + 5). What you want is to find the percentage of students with an IQ above 120.

The way I'd handle this is starting with what I know is absolutely, without a doubt, below 120. If you drew a quick bell curve to represent this data, everything to the left of the mean, 110, could be counted out right away (I usually color in half of the bell curve because I like the visual representation). Just like that, 50% of your data is gone. From there, I know 120 is right at 2 standard deviations away, so I color in all the way up to the 95% mark, but remember that when we took away 50%, you don't want to count all the standard deviations on the left side of the bell curve twice. So instead, take the 95% and cut it in half, which is 47.5%. Alternatively, you can start at 50% and count up 1 standard deviation (34%), and up one more (13.5%) and get the same result, 47.5%. So now you know 50 + 47.5 = 97.5% of results are LOWER than 120. To figure out what's higher than 120, all you have to do is see that

100% - 50% - 47.5% = 2.5%

And then you can see that 2.5% of students have an IQ over 120.

5 0
3 years ago
The circumference of Circle F is 72 cm. What is the length of Arc DE (the minor arc)?
Tom [10]

You need to first set up the equation:

It would look like 90 divided by 360 multiplied by the given circumference which is 72 cm.

So 90 / 360 x 72

Simply the fraction above, it will give us:

¼ x 72

So the answer would be 18 cm that is the length of DE (minor arc)

4 0
3 years ago
Read 2 more answers
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