Who knows math very well I need help with this test

The weights, in pounds, of a group of student are as follows: 173 123 171 175 188 120 177 160 151 169 162 128 145 140 158 132 20

Akimi4 [234]

Mean: 160.12
Standard Deviation: 19.76
Median: 162
Maximum: 202
Minimum: 120

The mean is calculated by adding all of the numbers in the data set and dividing by the number of values that were added:

173 + 123 + 171 + 175 + 188 + 120 + 177 + 160 + 151 + 169 + 162 + 128 + 145 + 140 + 158 + 132 + 202 + 162 + 154 + 180 + 164 + 166 + 157 + 171 + 175 ÷ 25 = 160.12

Standard deviation is found by calculating the mean (160.12) , and then subtracting the mean and square root result for each number. Finally, working out the mean of the squared differences and taking the square root of the final answer results in a standard deviation of 19.76. (The attached image has the formula for finding standard deviation).

Median is the number that is found in the middle when placing the numbers in order from least to greatest.

The maximum is the largest number in the data set.

The minimum is the smallest number in the data set.

5 0

4 years ago

Read 2 more answers

How do you solve #-(1+7x)-6(-7-x)=36#?

taurus [48]

- (1 + 7x) - 6(- 7 - x) = 36
- 1 - 7x + 42 + 6x = 36
41 - x = 36
- x = - 5

x = 5

7 0

3 years ago

Am I correct? I need help with #4 confused...

Anettt [7]

Answer:

3. 12 airplanes and 6 cars

4. 30 swirled marbles and 22 solid marbles

Step-by-step explanation:

In each case, it is easy enough to check the offered answer to see if it matches problem requirements.

3. You are correct.

__

4. All answers total 52 marbles, so we need to check to see which has 8 more swirled marbles.

a) 28 more swirled marbles

b) 28 fewer swirled marbles

c) 8 fewer swirled marbles

d) 8 more swirled marbles -- as required by the problem

The correct choice is the last one: 30 swirled marbles; 22 solid marbles.

_____

The first step in solving any problem is to understand what the problem is and what a solution will look like. When the questions are multiple-choice, it is often easier to check the choices than to solve the problem from scratch. Knowing what the solution must look like often lets you eliminate half or more of the answer choices, simplifying the remaining checking.

_____

Both of these are "sum and difference" problems. You are given the total of two items and the difference between them. The generic solution is that the larger quantity is half the sum of the two given numbers.

<u>For 3</u>, this means the number of airplanes (the larger quantity) is half of 18+6=24, so is 12. The number of cars is 6 less than that: 12-6=6.

<u>For 4</u>, this means the number of swirled marbles (the larger quantity) is half of 52+8=60, so is 30. The number of solid marbles is 8 less than that: 30-8=22.

6 0

3 years ago

A painter used 20 drops of red paint to make a certain shade of pink.How many drops of white paint should he add to 12 drops of

denis-greek [22]

You have to do 12 divided by 20 to get ur answer which is 0.6 or 6

6 0

4 years ago

What is the equation of a line passing through (-3, 7) and having a slope of -1 ?

il63 [147K]

Answer:

Using the information given, we can use the point-slope form:

y - y1 = m(x - x1)

y - 7 = -1(x + 3)

y - 7 = -x - 3

+7 +7

y = -x + 4, this is slope-intercept form

x + y = 4, this is standard form

4 0

3 years ago