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tangare [24]
3 years ago
8

The school dance committee wants to know whether the students in the entire school prefer ballet or jazz. The dance committee dr

aws a random sample from the following groups: All students on the dance team All students in each grade All girls in each grade All school teachers Which of the following groups best represents the population they should take a random sample from to get the best results for their survey? All students on the dance team All students in each grade All girls in each grade All school teachers
Mathematics
2 answers:
svlad2 [7]3 years ago
8 0

Answer:all students in each grade

Step-by-step explanation:

ss7ja [257]3 years ago
3 0

Answer:

All students in each grade

Step-by-step explanation:

This is because they want to know weather  the students in the entire school prefer ballet or jazz.

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A foreman for an injection-molding firm admits that on 55% of his shifts, he forgets to shut off the injection machine on his li
motikmotik

Answer:

0.8594

Step-by-step explanation:

Let a denote the event of forgetting to shut off machine and b be the event of being defective.

-A foreman forgets to shut off machine 55% of the time.

-If he forgets, 15% of molds are defective.

-If he does not, 3% of molds are defective.

#The probability that he forgot to shut off the machine is calculated as:

P(a \ and \ b)=0.55\times 0.15\\\\=0.0825\\\\

P(a and ~b)=0.55(1-0.15)=0.4675

P(~a and b) = (1-0.55)*0.03=0.0135

P(~a and ~b) = (1-0.55)*(1-0.03)=0.4365

#Conditional probability is defined as:

P(a|b)=\frac{P(a \ and\  b)}{P(a)}\\\\=\frac{P(a \ and \ b)}{[(P(a \ and \ b)+P(\~a \ and \ b)}\\\\\\=\frac{0.0825}{0.0825+0.0135}\\\\\\=0.8594

Hence,  the probability that the foreman forgot to shut off the machine the previous night is 0.8594

5 0
3 years ago
Write an equation for the line in the given form.
Sergeeva-Olga [200]
Y-2=5(x+3) is the the answer
3 0
3 years ago
HELP FAST PLEASE! FOR BRAINLIEST!!
Gekata [30.6K]

Answer:

1. C-surface area

2. The formula V = B x h is not suitable, because the surface area of wrapping paper needed to be calculated, not the volume.

V = Ph + 2B = 15x(5+6+9) + 2x 9x3/2 = 327

3. B: Base area

   H: Height of solid

4. She said V =220, while V_real = 7x6x4 =168

=> She is wrong

5. Check the Pythagorean theorem 3^2+4^2 =9+16 =25 =5^2

=> Right triangle.

=> Area = 3x4/2 =6

4 0
4 years ago
Can you explain with steps
bonufazy [111]

Answer:

Yep

1. Click ask question at the top

2. type your question or add a picture

3. then click Ask

but you messed up in step 2 because you didn’t add a picture! Your Welcome

Step-by-step explanation:

5 0
3 years ago
1. Solve for x.
bekas [8.4K]
Hope this helps
1. X= 4
2. X=7
3. 8.7x10^10
3 0
3 years ago
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