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3 years ago

Help pplsllsls brainiest???

Mathematics

1 answer:

Anvisha [2.4K]3 years ago

5 0

Hellor rnirde ejrjfndndodnff

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The distribution of the Iowa Test of Basic Skills (ITBS) vocabulary scores for 7th-grade students in Gary, Indiana is Normal wit

AleksAgata [21]

Answer:

49.85% of ITBS scores are between 3 and 12

Step-by-step explanation:

The Empirical Rule states that, for a normally distributed random variable:

68% of the measures are within 1 standard deviation of the mean.

95% of the measures are within 2 standard deviation of the mean.

99.7% of the measures are within 3 standard deviations of the mean.

In this problem, we have that:

Mean = 12

Standard deviation = 3

The normal distribution is symmetric, which means that 50% of the scores are below the mean and 50% are below.

What percent of ITBS scores are between 3 and 12

12 is the mean

3 = 12 - 3*3

3 is three standard deviations below the mean.

By the Empirical Rule, of the 50% of the measures which are below the mean(below 12), 99.7% are within 3 standard deviations of the mean, that is, above 3.

p = 0.5*0.997 = 0.4985

49.85% of ITBS scores are between 3 and 12

7 0

3 years ago

23 and a half divided by 4

kkurt [141]

Answer:

$\frac{47}{8}$

Step-by-step explanation:

1) Rewrite the words into an equation:

$23\frac{1}{2}$ ÷ 4

2) Change the division sign to a multiplication sign and find the reciprocal of 4 (flip the numerator and denominator of 4):

$23\frac{1}{2} * \frac{1}{4}$

3) Change the mixed number into an improper fraction:

$\frac{47}{2} * \frac{1}{4}$

4) Multiply:

$\frac{47}{8}$

5 0

4 years ago

Find the midpoint of the line segment<br> with endpoints (-4, 16) and (6, -10).

Alenkasestr [34]

Answer:

Step-by-step explanation:

<h3>What is a midpoint?</h3>

Midpoint a point equidistant from the ends of a line or the extremities of a figure.

To find the midpoint of the line segment with endpoint, use the midpoint formula.

<u>Midpoint formula:</u>

$\Rightarrow: \sf{\dfrac{x_2+x_1}{2}, \dfrac{y_2+y_1}{2} }}}$

y2=(-10)

y1=16

x2=6

x1=(-4)

<u>Rewrite the problem down.</u>

$\sf{\left(\dfrac{6-4}{2},\:\dfrac{-10+16}{2}\right)}$

<u>Solve.</u>

6-4=2

2/2=1

-10+16=6

6/2=3

Therefore, the correct answer is B (1,3).

I hope this helps, let me know if you have any questions.

To learn more about midpoint:

brainly.com/question/5127660

#SPJ1

3 0

2 years ago

A rectangle has a length of 9 meters and a height of 6 meters what is the area?

SCORPION-xisa [38]

Answer:

54 is the area

Step-by-step explanation:

you do 6 x 9=54

8 0

4 years ago

What is the solution to x-2<6 ?<br>x < 6<br>x>6

True [87]

The solutions are: x=3+ √3 and x=3-√3

4 0

3 years ago