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3 years ago

Help my son with this question becuz even I don't know it

Mathematics

2 answers:

evablogger [386]3 years ago

6 0

The answer for the question is B

hodyreva [135]3 years ago

4 0

Answer:

Step-by-step explanation:

4 times $\frac{2}{3}$

$\frac{4}{2} times \frac{2}{3}$

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The shear strength of each of ten test spot welds is determined, yielding the following data (psi).

Mumz [18]

Answer:

a) Mean = 382.3 psi

Standard deviation = 20.8 psi

b) 392.7 psi

c) P(X<400)=0.8026

Step-by-step explanation:

a) The population mean can be estimated as equal to the mean of the sample, and the population standard deviation can be estimated from the sample standard deviation:

$M=\frac{1}{n}\sum x_i=\frac{1}{10}(389+405+409+367+358+415+376+375+367+362)\\\\M=\frac{1}{10}(3823)=382.3\\\\\mu\approx M=382.3$

$s=\sqrt{\frac{1}{n-1}\sum (x_i-M)^2}=\sqrt{\frac{1}{10-1}(389-382.3)^2+...+(362-383.2)^2}\\\\\\s=\sqrt{\frac{1}{9}(3906.1)}=\sqrt{434}=20.8\\\\\\\sigma\approx s=20.8$

b) We start by searching for the z-value for the 95th percentile. This value is

z=1.645:

$P(z$

Then, the strength value below which 95% of all welds will have their strengths is:

$X=\mu+z\cdot \sigma/\sqrt{n}=382.3+1.645*20.8/\sqrt{10}\\\\X=382.3+32.9/3.2=382.3+10.4\\\\X=392.7$

c) We calculate the probability of X being equal or less than 400 as:

$z=(X-\mu)/\sigma=(400-382.3)/20.8=17.7/20.8=0.851\\\\\\P(X\leq400)=P(z$

6 0

3 years ago

The question is in the photo :)

Over [174]

Answer:

My guess is 105

Step-by-step explanation:

7 x 15

8 0

3 years ago

Read 2 more answers

A. m∠ADB = (7x + 27)° Find x .

Helen [10]

Answer:

x = 9

y = 12

Step-by-step explanation:

✔️m<ADB = 90°

7x + 27 = 90

7x = 90 - 27

7x = 63

Divide both sides by 7

x = 9

✔️BC = 2(BD)

3y - 7 = 2(y + 3)

3y - 7 = 2y + 6

Collect like terms

3y - 2y = 7 + 6

y = 12

8 0

3 years ago

Ben is three times as old as Kate. Kate is 6 years older than Jill. Jill is J years old. What is the combined age of the three p

harkovskaia [24]

Answer:

the combined age of the three people is

5 J + 24

Step-by-step explanation:

Jill (J)

Kate (J+6)

Ben 3(J+6)

J + (J+6) + 3(J+6)

J+J + 6 +3 J +18

5 J + 24

8 0

3 years ago

Find (f*g)(x) for f (x) = 3x^2 and g (x) = 5-x

ludmilkaskok [199]

(F*g) means f ( g(x) ) . Knowing this we can say
F(g(x)) = 3(5-x) ^2
= 3 (5-x)(5-x)
=

6 0

3 years ago