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3 years ago

The table shows the number of boys and girls that have black blonde brown or red hair color.

Mathematics

2 answers:

Naddik [55]3 years ago

5 0

Answer:

A) 0.23

Step-by-step explanation:

There are 9 black-haired students, out of 40 students.

= 0.23

skad [1K]3 years ago

3 0

Answer:

The answer would be A

Step-by-step explanation:

if you add the students that have only black hair and all the students together and put it as a fraction of black hair over total students, you get 9/41. you divide that and you get 0.219 and rounding you get 0.22 and the closest answer is A.

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For the formula F = 95K – 455.67, what is the value of K when F = 0?

Inessa [10]

Answer:

K = 4.8

Step-by-step explanation:

Equation Solving

We are given the equation:

F = 95K - 455.67

We are required to find the value of K when F=0:

95K - 455.67 = 0

Adding 455.67:

95K = 455.67

Dividing by 95;

K = 4.8

4 0

3 years ago

PRACTICE ANOTHER Calculate the standard deviation σ of X for the probability distribution. (Round your answer to two decimal pla

nataly862011 [7]

Complete Question

The complete question is shown on the first uploaded image

Answer:

The standard deviation is $\sigma = 1.17$

Step-by-step explanation:

From the question we are told that

The data is

x 1 2 3 4

P(X = x) 0.2 0.2 0.2 0.4

Generally the standard deviation is mathematically represented as

$\sigma = \sqrt{ \sum x^2 P(x) - (\sum x P(x))^2 }$

Here $x^2 = 1^2 \ \ 2^2 \ \ 3 ^2 \ \ 4^2$

=> $x^2 = 1 \ \ 4 \ \ 9\ 16 \$

$\sum x^2 * P(x) = (1 * 0.2) + (4 * 0.2 ) + (9 * 0.2 ) + (16 * 0.2 )$

$\sum x^2 * P(x) = 9.4$

$\sum x P(x) = (1 *0.2) + (2*0.2) + (3 * 0.2) + (4 * 0.2)$

$\sum x P(x) = 2.8$

$\sigma = \sqrt{ 9.2 - (2.8)^2 }$

$\sigma = 1.17$

6 0

3 years ago

If 5b=6a+16 and 9a=7b-20, then what are the values of a and b? show work.

Strike441 [17]

Answer:

a = 4, b = 8

Step-by-step explanation:

Rewrite 5b=6a+16 and 9a=7b-20 vertically:

5b=6a+16

9a=7b-20

Let's use substitution. Solve the first equation for b:

6a + 16

b = --------------

Substitute this result into the second equation:

9a = 7(b) + 16, or

6a + 16

9a = 7*-------------- - 20

Eliminate the fraction by multiplying all three terms by 5:

45a = 7(6a + 16) - 100, or

3a = 112 - 100, or:

3a = 12, which leads to a = 4.

Find b by subbing 4 for a in either of the given equations:

5b = 6(4) + 16, or

5b = 40, leading to b = 8

The solution is a = 4, b = 8

3 0

3 years ago

Given the equation 5 + x - 12 = x - 7.

Anuta_ua [19.1K]

Answer:

part A= x=1

part B= -13=-11 and -7=-7 and -2=-2

Step-by-step explanation:

part A

5+x-12=x-7

-7+x=x-7

x=1

part B

5+(-4)-12=-4-7

-1-12=-4-7

-13=-4-7

-13=-11

5+x-12=x-7

5+(-12)=-7

-7=-7

5+x-12=x-7

5+5-12=5-7

10-12=-2

-2=-2

5 0

4 years ago

50 points! Solve: 5a + 6.9 = 3.6a +16.28

icang [17]

A = 6.7 :) hope this helps I double checked

6 0

3 years ago

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