Statistics

Question 1

Number of integers in a set (inclusive)

Answer 1

Highest-lowest+1

Question 2

Number of multiples in a set of consecutive integers

Answer 2

Highest multiple-lowest multiple/number you look for (all this + 1)

Question 3

Average of consecutive integers

Answer 3

Highest + lowest /2

Question 4

When are median and average equal?

Answer 4

When consecutive integers in a symmetric line

Question 5

How to find median in evenly spaced set

Answer 5

Median =(n+1)/2 position if odd
Median = average of n/2 and (n+2/2) positions if even (los dos del medio

Question 6

What is the mode

Answer 6

Number that appears the most

Question 7

Standard deviation rule one

Answer 7

If you add or subtract a constant it doesn’t change

Question 8

SD rule two

Answer 8

If you multipu or divide each term by a constant (SD will be multiplied or divided equally)

Question 9

Number of terms in an evenly spaced sequence

Answer 9

(Last term - first term)/increment +1

Question 10

Nth term of arithmetic progression

Answer 10

An = a1 +d(n-1)

Question 11

Sum of first n terms (you can also use sum = average × quantity)

Answer 11

Sn= n/2(a1 + an)