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3 years ago

I need help this is 7th grade homework

Mathematics

1 answer:

Alla [95]3 years ago

8 0

Number of weeks in a year divided by 6, then multiply that answer by $108

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A certain test preparation course is designed to help students improve their scores on the LSAT exam. A mock exam is given at th

OlgaM077 [116]

Answer:

Interval [16.34 , 21.43]

Step-by-step explanation:

First step. <u>Calculate the mean</u>

$\bar X=\frac{(23+18+23+12+13+23)}{6}=18.666$

Second step. <u>Calculate the standard deviation</u>

$\sigma =\sqrt{\frac{(23-18.666)^2+(18-18.666)^2+(23-18.666)^2+(12-18.666)^2+(13-18.666)^2+(23-18.666)^2}{6}}$

$\sigma=\sqrt\frac{18.783+0.443+18.783+44.435+5.666+18.783}{6}$

$\sigma=\sqrt{17.815}=4.22$

As the number of data is less than 30, we must use the t-table to find the interval of confidence.

We have 6 observations, our level of confidence DF is then 6-1=5 and we want our area A to be 80% (0.08).

We must then choose t = 1.476 (see attachment)

Now, we use the formula that gives us the end points of the required interval

$\bar X \pm t\frac{\sigma}{\sqrt n}$

where n is the number of observations.

The extremes of the interval are then, rounded to the nearest hundreth, 16.34 and 21.43

6 0

3 years ago

One less then five times a number is fewer then twenty four

NISA [10]

5n - 1 < 24 is the inequality in question. Add 1 to both sides, obtaining:

5n < 25. Divide both sides by 5, obtaining n < 5 (answer)

3 0

3 years ago

What is 79.4÷8 what is the answer in decimal form

forsale [732]

79.4 / 8 is;

9.925. Hope this helps you.

4 0

3 years ago

Read 2 more answers

Enter the length ,X of the ramp in inches (no links need answers ASAP)

topjm [15]

Answer:

53 inches

Step-by-step explanation:

use the Pythagorean Theorem

c^2 = a^2 + b^2

x^2 = 28^2 + 45^2

x^2 = 784 + 2025

x^2 = 2809

Take the square root of both sides

x = 53

8 0

3 years ago

One month Ivanna rented 7 movies and 9 video games for a total of $80. The next month she rented 5 movies and 3 video games for

ZanzabumX [31]

Answer:

each movie costs $2.75, each video game costs $6.75

Step-by-step explanation:

x = movies, y = video games

7x + 9y = 80

5x + 3y = 34

simplified to

x = 11/4 , y = 27/4

5 0

3 years ago