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Marat540 [252]
2 years ago
15

1. What is the degree of 3x³y²z + 2xy³ - 9y + 5? A. 3 B. 4 C. 5 D. 6

Mathematics
2 answers:
devlian [24]2 years ago
7 0

Answer:

--------------HeyA BenjamiN-----------------

Explanation :

  • All you need to do is count up the powers of each term and then sum it , the highest power is considered to be the degree.

SolvinG :

  • 3x³y²z = 6
  • 2xy³ = 4
  • 9y = 1

- Our final answer is 6 .

---------------HappY LearninG <3 -------------

abruzzese [7]2 years ago
3 0

Answer:

d. 6

Step by step explanation:

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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
1 year ago
A 4 pound roast must be cooked for 30 minutes per pound and must rest for 15 minutes when must it be put into the oven in order
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So put it in 2 hours and 15 minutes before 6pm which would be 3:45
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3 years ago
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Alexus [3.1K]
They both are complementary angles i.e their sum must equals 90°

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Answer:

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Step-by-step explanation:

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