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son4ous [18]
2 years ago
9

PLEASE HELP, GIVING BRAINLIEST, PLEASE EXPLAIN ANSWER, 20 points, make sure answers is right

Mathematics
2 answers:
WINSTONCH [101]2 years ago
6 0
The top is correct I checked
valentinak56 [21]2 years ago
4 0

Answer:

1 = 245

2 = 54

3 = 168

4 = 288

Step-by-step explanation:

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A cylinder of clay has a diameter of 12 cm and a height of 12 cm. If this clay is made into congruent cones with a radius of 3 c
DanielleElmas [232]

Step-by-step explanation:

volume of the cyclinder=πr²h

=π×6²×12

=432π cm³

volume of a cone=1/3πr²h

=1/3π×9×8

=24π cm³

number of cones=432π/24π=18 cones

8 0
3 years ago
he life of light bulbs is distributed normally. The variance of the lifetime is 625 and the mean lifetime of a bulb is 540 hours
almond37 [142]

Using the normal distribution, it is found that there is a 0.877 = 87.7% probability of a bulb lasting for at most 569 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.

The mean and the standard deviation are given, respectively, by:

\mu = 540, \sigma = \sqrt{625} = 25

The probability of a bulb lasting for at most 569 hours is the <u>p-value of Z when X = 569</u>, hence:

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

Z = \frac{569 - 540}{25}

Z = 1.16

Z = 1.16 has a p-value of 0.877.

0.877 = 87.7% probability of a bulb lasting for at most 569 hours.

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

#SPJ1

8 0
2 years ago
In the supermarket, there is a scale that measures the weight of fruit and vegetables. The needle is 24 cm long and it rotated 9
Mumz [18]
We find the length of the arc followed by the needle. For this, we first need to convert the subtended angle to radians:
96/∅ = 180/π
∅ = 1.68 rad
S = r∅
S = 24 x 1.68
Distance covered by needle = 40.32 cm
4 0
3 years ago
Read 2 more answers
A class of 31 students average 82 on a recent exam. Two students were absent and took the exam the next day. The two students av
dedylja [7]

Find the total points for each group:

31 students averaged 82, so the total points were 31 x 82 = 2542

2 students averaged 88, so the total points were 2 x 88 = 176

Now add the total points and divide by 33 students (31 +2):

2542 + 176 = 2718

2718 / 33 = 82.36

The average is 82.36 ( Round as needed).

4 0
3 years ago
Read 2 more answers
Need help on 13 , 14 and 15 please
Andru [333]
6$ for 13 but I can’t see instructions
7 0
3 years ago
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