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Shalnov [3]
3 years ago
7

Is it essary to rename 4 1/4 if you subtract 3/4 from it.

Mathematics
1 answer:
Archy [21]3 years ago
3 0
No . because you would then have 2/4 which is 1/2 50%

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Nick can read 3 pages in 1 minute . Write the ordered pairs (numbers of minutes , number of pages read ) for nick reads 0,1,2 an
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0,0     1,3 .     2,6 .       3,9       where x is the number of pages and y is the number of minutes
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Weekly demand for milk at a small grocery store is normally distributed with a mean of 251 gallons per week and standard deviati
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Solution

Given

mean = 251

standard deviation = 33

(a)

\begin{gathered} P(Z

Hence, X = 300

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Calculate 6.75 tax on 23.05
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What is the length of the line segment that is graphed from (+2, +5) to (+2, +8)?
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The length of the line segment is 3.

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3 years ago
The size of the left upper chamber of the heart is one measure of cardiovascular health. When the upper left chamber is enlarged
Temka [501]

Answer:

a) 0.283  or 28.3%

b) 0.130 or 13%

c) 0.4 or 40%

d) 30.6 mm

Step-by-step explanation:

z-score of a single left atrial diameter value of healthy children can be calculated as:

z=\frac{X-M}{s} where

  • X is the left atrial diameter value we are looking for its z-score
  • M is the mean left atrial diameter of healthy children (26.7 mm)
  • s is the standard deviation (4.7 mm)

Then

a) proportion of healthy children who have left atrial diameters less than 24 mm

=P(z<z*) where z* is the z-score of 24 mm

z*=\frac{24-26.7}{4.7} ≈ −0.574

And P(z<−0.574)=0.283

b) proportion of healthy children who have left atrial diameters greater than 32 mm

= P(z>z*) = 1-P(z<z*) where z* is the z-score of 32 mm

z*=\frac{32-26.7}{4.7} ≈ 1.128

1-P(z<1.128)=0.8703=0.130

c) proportion of healthy children have left atrial diameters between 25 and 30 mm

=P(z(25)<z<z(30)) where z(25), z(30) are the z-scores of 25 and 30 mm

z(30)=\frac{30-26.7}{4.7} ≈ 0.702

z(25)=\frac{25-26.7}{4.7} ≈ −0.362

P(z<0.702)=0.7587

P(z<−0.362)=0.3587

Then P(z(25)<z<z(30)) =0.7587 - 0.3587 =0.4

d) to find the value for which only about 20% have a larger left atrial diameter, we assume

P(z>z*)=0.2 or 20% where z* is the z-score of the value we are looking for.

Then P(z<z*)=0.8 and z*=0.84. That is

0.84=\frac{X-26.7}{4.7}  solving this equation for X we get X=30.648

5 0
3 years ago
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