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-BARSIC- [3]
3 years ago
7

I don't understand this problem on my homework can explain to me how to solve it?

Mathematics
1 answer:
user100 [1]3 years ago
8 0
So he worked 30.5 hours, he just didn't write some of the hours down. To find the hours he didn't write down, you subtract 8+7\frac14+ 8\frac12 from 30.5, which equals 6 \frac14

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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.

8 0
3 years ago
How many lemons are needed to fill 375 ml bottle of lemon juice if 2 large lemons fill 100ml
umka21 [38]

Answer:

Answer:

7 and half

Explanation:

cuz if the two lemin fill two then one will fill 50ml ,

then,7×50=350 the remaining is 25 ml which is half of 50 ml so this is half of one lemon.so the answer is 7 and half

8 0
2 years ago
Read 2 more answers
Estimate the product of 204 times 0.46
nikdorinn [45]
204 times .46 equals 93.84, to round of it would be 93.8
3 0
3 years ago
5.346 - 2.289= 3.057 <br><br> SHOW WORK!!!! <br><br> WILL GIVE BRAINLIEST PLEASE
Ilya [14]
brainly.com/question/13983892
5 0
2 years ago
Tell whether x and y show direct variation. x + y = 6​
Over [174]
<h3>Answer: Not direct variation</h3>

The reason why is because it can't be written in the form y = kx

If we solved the given equation for y, we get y = -x+6. It has a y intercept of 6, but it should be zero if we wanted a direct variation equation.

5 0
2 years ago
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