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svp [43]
3 years ago
9

Can someone please help me I am stuck like chuck

Mathematics
2 answers:
Ann [662]3 years ago
8 0
The mean will increase
Morgarella [4.7K]3 years ago
8 0
The mean would increase
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2. A random sample of 30 households was selected as part of a study on electricity usage, and the number of kilowatt-hours (kWh)
Brrunno [24]

Answer:

Step-by-step explanation:

Given that n =30, x bar = 375 and sigma = 81

Normal distribution is assumed and population std dev is known

Hence z critical values can be used.

For 95% Z critical=1.96

Margin of error = 1.96(\frac{81}{\sqrt{30} } )=29

Confidence interval = 375±29

=(346,404)

B) 99% confidence

Margin of error = 2.59*Std error =38

Confidence interval = 375±38

=(337, 413)

C) For 90%

Margin of error = 20

Std error = 20/1.645 = 12.158

Sample size

n=(\frac{81}{12.158} )^2\\=44.38

Atleast 44 people should be sample size.

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3 years ago
if the scale drawing is 1:30,what should you do with each measurements of the drawing to get the actual dimensions. Plz help fas
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The scale will continuously go up per section, 2:60, 3:90.
7 0
3 years ago
The run is the blank
scoray [572]

Answer:

rise over run

Step-by-step explanation:

5 0
3 years ago
7x-3=4x+3 < Answer Please
USPshnik [31]

Answer:

2! Thank it if it was helpful :D

Step-by-step explanation:

7x-4x=3+3

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8 0
3 years ago
Read 2 more answers
What is the product of (-a + 3)(a + 4)?
spayn [35]

Answer: The product of (-a + 3)(a + 4) is:  -a^2-a+12

Step-by-step explanation:

(-a+3)(a+4) = -a*a-a*4+3*a+3*4

=-a^{2} -4a+3a+12

now just simply combine..

=-a^2-a+12

the answer is -a^2-a+12

8 0
2 years ago
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