Please help me I do not understand :(

Mathematics

2 answers:

Liula [17]3 years ago

8 0

Answer:

1. trapezoid

3. yes, just draw two random right angles and then make them intersect lol

4. rectangle, perimeter of 30

5. no, 3 right angles will equal 4

kvv77 [185]3 years ago

4 0

Answer:

Step-by-step explanation:

1. trapezoid

2. no not possible lol how do you even do that lol a square has only 90 degree angles and then an obtuse angle pops in no doesn't happen

3. yes just draw two random right angles and then make them intersect lol

4. rectangle, perimeter of 30

5. no

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the price of a car was reduced to 25% off the car is now £14.625 work out what the car was before it was reduced

Bezzdna [24]

Somewhere between 20 to 25

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3 years ago

The highway mileages of 147 cars are in a file named CARS2.† These cars are 2003 models. Find the mean, standard deviation, and

grigory [225]

In statistics, mean is the average in a set of data collected. To calculate the mean, you have to add up all the numbers in the table and divide it by the number of data that exists. For example, if the data set is 2 4 1 5 2 8, the mean will be:

mean = $\frac{(2+4+1+5+2+8)}{6}$ = 3.6

So, for this data set, the mean is 3.6.

The median is also a average number, however, the median is the middle value in the list. For example, with the data set above, the median is 3, because, as the set has an even number of data, the middle term would be the mean of the two middle number, in other words:

median = $\frac{1+5}{2}$ = 3

The standard deviation (σ) is the spread of data distribution, which means it's how "far" a number is from the mean of the set. The formula is

σ = √∑ (x - μ)²/N, where ∑ is the total sum; μ is the mean; and N is the number of data points in the sample. So, to calculate the standard deviation, using the example:

1) Calculate the mean of the set: μ=3.6

2) Find the difference between each data point and the mean and then, the square of each one:

(2-3.6)² = 2.56;

(4-3.6)² = 0.16

(1-3.6)² = 6.76

(5-3.6)² = 1.96

(2-3.6)² = 2.56

(8-3.6)² = 19.36

3) Add up all the squares: ∑= 33.36

4) Divide by the number of data points: $\frac{33.36}{6}$ =5.56