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charle [14.2K]
4 years ago
5

A simple random sample of 64 8th graders at a large suburban middle school indicated that 88% of them are involved with some typ

e of after school activity. find the margin of error associated with a 98% confidence interval that estimates the proportion of them that are involved in an after school activity.
Mathematics
1 answer:
ZanzabumX [31]4 years ago
5 0
The margin of error of a 98% confidence interval is given by


ME=2.33\left(\sqrt{ \frac{p(1-p)}{n} }\right) \\  \\ =2.33\left(\sqrt{\frac{0.88(1-0.88)}{64}}\right) \\  \\ =2.33\left(\frac{0.1056}{64}\right)=2.33(0.0406) \\  \\ =0.0946
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Six out of every 100 men are taller than 1.85m.
Andru [333]

Answer:

The probability of the man shorter than 1.85m is 2 in 5.

7 0
4 years ago
the number if baskets nikki can make varies directy with the time she spends making the baskets she can make 4 baskets in 1/2 an
Amanda [17]

Answer:

40 baskets

Step-by-step explanation:

Find out how many baskets she can make in an hour. Since she makes 4 in 1/2 an hour, multiply 4 by 2 to find out how much she makes in an hour. She makes 8 baskets an hour, so multiply 8 by 5. 8 x 5 = 40.

3 0
3 years ago
Read 2 more answers
Item C sold for 5$ and item D sold for 7 you sold a combined total of 60 of item c and D and you made 400$ how many of each item
Aneli [31]

Answer:

50 of D and 10 of C

Step-by-step explanation:

First of all, put this data into 2 equations.

You sold 60 items, so C+D=60

C is $5 so we can represent it by 5C

D is $7 so we can represent it by 7D

You made $400 total from C and D, so 5C+7D=400

We can use simultaneous equations to solve this.

To eliminate one of these variables, we'll multiply the first one by 5 to make it 5C like the other.

5(C+D=60)     (make sure you multiply both sides.)

so 5C+5D=300

5C+7D=400

Now we solve it:

5C-5C+7D-5D=400-300

7D-5D=100

2D=100

D=50

Now we can substitute this with one of the equations to find C

C+50=60

C=60-50

C=10

so, (10x5)+(50x7)=400

4 0
4 years ago
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scoray [572]
<span>A relationship between two variables in which one is a constant multiple of the other. The constant here is also called the constant of variation. In order to obtain this value, we manipulate the equation by isolating the variables. We do as follows:

</span><span>2x +6y = 0
y = -x/3

Therefore, the constant of variation is -1/3. Hope this answers the question. Have a nice day.</span>
5 0
3 years ago
What value of x is in the solution set of –5x – 15 &gt; 10 + 20x?
Blizzard [7]
-5x - 15 > 10 + 20x / + 15
-5x > 25 + 20x / - 20x
-25x > 25 / ÷ ( -25 )
x < - 1
7 0
3 years ago
Read 2 more answers
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