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ELEN [110]
3 years ago
15

A production process manufactures electronic components with timing signals whose duration follows a normal distribution. A rand

om sample of 55 components was​ taken, and the durations of their timing signals were measured.a. The probability is 0.01 that the sample variance is bigger than what percentage of the population​ variance?
b. The probability is 0.05 that the sample variance is less than what percentage of the population​ variance?
Mathematics
1 answer:
REY [17]3 years ago
8 0

Answer:

Check the explanation

Step-by-step explanation:

b ) P(s^2

or , P\left (\frac{(n-1)s^2}{\sigma^2}

or , P\left (\chi^2_5

or , 5p =1.145476

or , p =\frac{1.145476}{5}= 0.2290952

Required percentage = 22.91

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3.7 or 3.71428571429

Step-by-step explanation:

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If 4(x-2/3)=-18, what is the value of 2x?
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3 years ago
How do you convert 21.76 into a fraction
Bezzdna [24]

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21 19/25

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21 76/100

divide 76 and 100 by 4

21 19/25

4 0
3 years ago
Whoever checks my work and tell what I did wrong and the right answer will
gulaghasi [49]

Answer:

See below

Step-by-step explanation:

I believe that you only had to do letters F, H, and J. In that case, let's go over each one!

F: For isolatingd_{1}, we need to get rid of the 1/2 first. Let's multiply each side by 2:

2*m = 2*\frac{1}{2}(d_{1}+  d_{2}) \\2m = d_{1}+  d_{2}

After this, we just subtract d_{2} from each side to get d_{1}=2m- d_{2}. Dark Blue is correct! Let's now plug in those numbers below:

d_{1}=2(10)- 13 = 20-13=7

G: Let's isolate the vw^2 on one side by subtracting y from each side:

vw^{2} +y-y=x-y\\vw^{2}=x-y

Let's now divide each side by v, then put each side under a square root to get our final answer:

\frac{vw^2}{v} = \frac{x-y}{v}\\  w^2 =  \frac{x-y}{v}\\\sqrt{w^2} = \sqrt{\frac{x-y}{v}} \\w=\sqrt{\frac{x-y}{v}}

Orange is correct! Again, let's solve the problem underneath:

w=w=\sqrt{\frac{38-(-7)}{5}} = \sqrt{\frac{38+7}{5}} = \sqrt{\frac{45}{5}}=\sqrt{9}=3

H: This one has some stuff that we haven't worked with quite yet (like terms), but our approach is the same: isolate c on one side of the equation.

2a-2a+3c=17a-2a+21\\3c = 15a+21\\\frac{3c}{3} = \frac{15a+21}{3}\\c = \frac{15a}{3}+ \frac{21}{3} \\c = 5a+7

Purple is correct! Let's solve the problem:

c = 5(\frac{16}{5})+7 = 16+7 = 23

7 0
3 years ago
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