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statuscvo [17]
3 years ago
8

PLEASE ANSWER FOR 15 POINTS!!

Mathematics
1 answer:
KATRIN_1 [288]3 years ago
4 0
The amount of paint required to paint the whole cupboard is:

https://tex.z-dn.net/?f=2%5Ctimes2.5%5E2%2B4%5Ctimes%282.5%5Ctimes3.5%29%0A%5C%5C%3D47.5+++ft%5E2

The amount of paint required to paint all but the bottom surface is:

https://tex.z-dn.net/?f=2.5%5E2+%2B+4%282.5%5Ctimes3.5%29%0A%5C%5C%3D+41.25+ft%5E2

So the difference in paint required is 6.25 square feet worth of paint.
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A particular battery claims to have a mean life of 400 hours with a standard deviation of 30 hours. Approximately what percent o
Svetach [21]

Using the normal distribution, it is found that 25.14% of the batteries will last more than 420 hours.

<h3>Normal Probability Distribution</h3>

The z-score of a measure X of a normally distributed variable with mean \mu and standard deviation \sigma is given by:

Z = \frac{X - \mu}{\sigma}

  • The z-score measures how many standard deviations the measure is above or below the mean.
  • Looking at the z-score table, the p-value associated with this z-score is found, which is the percentile of X.

In this problem, we have that the mean and the standard deviation are given, respectively, by:

\mu = 400, \sigma = 30.

The proportion of the batteries will last more than 420 hours is <u>one subtracted by the p-value of Z when X = 420</u>, hence:

Z = \frac{X - \mu}{\sigma}

Z = \frac{420 - 400}{30}

Z = 0.67

Z = 0.67 has a p-value of 0.7486.

1 - 0.7486 = 0.2514.

0.2514 = 25.14% of the batteries will last more than 420 hours.

More can be learned about the normal distribution at brainly.com/question/24663213

#SPJ1

3 0
1 year ago
Use the picture in the diagram 4<br> Help pls<br> Pretty pls too
Aliun [14]

Answer:

a

Step-by-step explanation:

5 0
2 years ago
Which linear inequality is represented by the graph?
LekaFEV [45]

Step-by-step explanation:

the linear inequality is how to measure value of a line through quality and quantity.

4 0
2 years ago
Urgent please help!!!
timama [110]

Answer:

well obvesly there is no answer

Step-by-step explanation:

8 0
3 years ago
If a chicken has 4kg of corn, how many days will it last it if it eats 1/8 of a kg of corn a day.
Gala2k [10]
It would take 32 days
7 0
3 years ago
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