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borishaifa [10]
3 years ago
5

A distribution of values is normal with a mean of 188 and a standard deviation of 20.8. Find the probability that a randomly sel

ected value is less than 167.2.
Mathematics
1 answer:
padilas [110]3 years ago
6 0

Answer:0.8413

Step-by-step explanation:

Mean= 188, Std Dev. =20.8, Z=(x-mean)/Std Dev

P(X less than 167.2)= P(Z less than (167.2-188)/20.8)

=P(Z less than (-20.8/20.8))

=P(z less than -1)= P(Z less 1)

The value of 1 in the normal distribution table is 0.3413

So we add 0.5 to 0.3413 =0.8413

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kkurt [141]

Hi! I'm happy to help!

Our town is composed of 2,000 people. Of those 2,000 people, 4/5 of them are middle class. The word 'of' usually means multiplication when it is in a word problem. So, we will multiply 2,000 by 4/5. When multiplying a whole number, we just multiply it by the numerator (top) and leave the denominator. (bottom)

2,000×4

8,000

8,000/5

Fractions are just a different way of putting division, so we can change this to a division problem:

8,000÷5=

1,600

1,600 of the people are middle class.

I hope this was helpful, keep learning! :D

8 0
3 years ago
−10x+5=−6x−35 ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo
Zarrin [17]

Answer:

x=10

Step-by-step explanation:

Add 6x to both sides.

−4x+5=−35

Subtract 5 from both sides.

−4x=−40  

Divide both sides by -4.

\frac{-4x}{-4}=\frac{-40}{-4}

x=10

hope this helps

8 0
3 years ago
Read 2 more answers
Help please. If answer is good i'll mark brainliest ;)
Mariulka [41]

You can't cheat you can't ask someone for help and ask for answers ;-;

6 0
3 years ago
Three ratios equivalent to 16:12
Elina [12.6K]

Answer:

48:36   64:48  60:80

Step-by-step explanation:

7 0
3 years ago
First answer gets marked brainliest!!!
strojnjashka [21]

Answer:

in neighbourhood q the total number of people in the nine families I higher than that in neighbourhood s because of we add up the number of people in the families in neighbourhood q we get a total of 35 yet we have a total of only 27 people in the nine families in neighbourhood s

hope that helps ❤

3 0
3 years ago
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