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Alexxandr [17]
3 years ago
5

Help meeee it's math ::Simplify an expression for the perimeter of the rectangle shown

Mathematics
1 answer:
bagirrra123 [75]3 years ago
5 0
8.6x + 3 + 8.6+3 =. 17.2x + 6


5.2+5.2= 10.4

17.2x + 6 = 10.4
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A scale drawing has a scale of 1/4in. :12ft. Find the length on the drawing for each actual length. 8ft
UNO [17]
The other part of your ratio is missing
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3 years ago
The blood platelet counts of a group of women have a boll-shaped distribution with a mean of 261.1 and a standard deviation of 6
alexandr402 [8]

The variable is

X: blood platelet count of a woman

This variable has a bell shaped distribution (Normal)

With mean μ=261.1 and standard deviation σ=64.3

a.

The platelet count within 3 standard deviations of the mean can be calculated as

μ±3σ

You can symbolize it as

μ-3σ ≤ X ≤ μ+3σ

According to the empirical rule of the normal distribution you know that under any bell shaped distribution:

Between μ ± σ you'll find the 68% of the distribution

Between μ ± 2σ you'll find the 95% of the distribution

Between μ ± 3σ you'll find the 99% of the distribution

So following this rule you'll find 99% of the women with platelet count within 3 standard deviations of the mean.

b.

3% of the population is found between a vertain interval, the rest 97% is separated in equal tails around this interval.

Divide 0.97 by 2

0.97/2= 0.485

Each tail contains 0.485 of the distribtuion.

a and b represent the values within you'll find 3% of the population.

Until a you'll find 0.485 of the population and until b you'll find 0.485+0.03=0.515

To calculate both unknown values you have to use the standard normal distribution. This distribution is centered in zero, the left tail is negative and the right tail is positive.

a and b are at a equal distance from the mean but with different sign, so you only have to calculate on and then you invert the sign to get the other one.

I'll calculate the positive value:

Z= (X- μ )/σ~N(0,1)

P(Z≤ b)=0.515

Look in the body of the Z-table, rigth or positive entry and reach the margins for the value:

b= 0.038

Then using the values of the mean and the standard deviation you can calculate the corresponding valueof platelet count:

b= (X- μ )/σ

0.038= (X- 261.1 )/64.3

0.038*64.3=X-261.1

2.4434+261.1=X

X=263.5434=263.5

a=-b=-0.038

a= (X- μ )/σ

-0.038= (X- 261.1 )/64.3

-0.038*64.3=X-261.1

-2.4434+261.1=X

X=258.6566= 258.7

3% of the populations platelet count is between 258.7 and 263.5.

3 0
9 months ago
Marvin can do one load of laundry with 1/16 box of laundry detergent. How many loads of laundry can he wash with 4 boxes of dete
Tcecarenko [31]

Answer:

64 loads of laundry, your welcome

3 0
3 years ago
Read 2 more answers
Simplify 9a+3+2a+10<br><br><br><br> thx
a_sh-v [17]
Hey there 

9a+3+2a+10
You have to collect like terms 

To simplify you have to add 9a and 2a. Then 3 and 10 
9a+2a= 11a 
10+3= 13 

The answer is 11a+13

hope this helps  <span />
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2 years ago
Read 2 more answers
Ramon is a waiter. He waits on a table of 4 whose bill comes to $99.69. If Ramon receives a 20% tip, approximately how much will
vlabodo [156]
99.69/100=.9969
.9969*20=19.938 
Ramon would receive ~ $19.94
4 0
3 years ago
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