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lora16 [44]
3 years ago
10

The lengths of one-year-old baby girls can be described using a normal distribution with a mean of 29 inches and a standard devi

ation of 1.2 inches. using the empirical '68-95-99.7' rule, what percent of one-year-old girls are shorter than 31.4 inches?
Mathematics
1 answer:
crimeas [40]3 years ago
6 0

The '68-95-99.7' rule says

-About 68% of values fall within one standard deviation of the mean.

-About 95% of the values fall within two standard deviations from the mean.

-Almost all of the values — about 99.7% — fall within three standard deviations from the mean.

Here 31.4=29+2*1.2 26.6=29-2*1.2

Therefore, the probability

P(26.6

The required probability

P(L

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d x 7 = 105

Step-by-step explanation:

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2 years ago
Find the difference 9x2-24x2
faust18 [17]
The answer is -30
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4 0
3 years ago
Solve for x by first setting up two equations. Then find the PRODUCT of your solutions |2x+5|=7
Kobotan [32]

Answer: see below

Step-by-step explanation:

|2x+5|=7

2x+5=±7 ⇔ since the absolutely value of any number is all positive, so the value in side can be either positive or negative

2x+5=7  or  2x+5=-7

    2x=2            2x=-12

      x=1      or       x=-6

----------------------------------------

The product of the two solutions

1 × -6=-6

Hope this helps!! :)

Please let me know if you have any question

5 0
3 years ago
Denali is making curtains for her room. She needs 12 feet of fabric for one curtain and 16 feet for the other. The fabric store
sineoko [7]
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4 0
3 years ago
Select the correct answer.
BaLLatris [955]

Answer:

80

Step-by-step explanation:

in the figure above, angle 100 degrees is corresponding to the angle co - interior to angle x

that is

if we put an angle that is at the upper left of x, we can call that y which is corresponding to 100 degrees

since y is corresponding to 100 degrees, it automatically becomes the same as 100 degrees

therefore y=100

now, from the first line above, we know that x and y are co-interior which means that they both add up to 180 degrees

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x+y=180

we know that y = 100

therefore,

x+100=180

collect like terms and

x = 180-100

therefore,

x= 80

thank you!!

7 0
3 years ago
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