Lesson 5: Various Landholdings Of Digits

Question 1

Integer formula

Answer 1

Int=m/f

F is a factor of m

M is a multiple of f

Question 2

Divisibility/Factor/Multiples?

Answer 2

Think int=m/f and prime factors!

Question 3

Sum of Set of Evenly Spaced Numbers=

Answer 3

Median (also the average) multiplied by the amount of terms in the set

Example: sum of all integers from 1-80:

(80+1)/2= 40.5

40.5*80 (terms)= 3,240

Question 4

Standard Deviation & Percentage within 1/2/3 SD’s

Answer 4

Average distance away from the mean in any given set

68, 95, 98.7% respectively

Question 5

Interquartile Range of Dataset

Answer 5

Q1- quartile marker 1 (median of first half of dataset)

Q2- quartile marker 3 (median of second half of dataset)

Question 6

Permutations and Combinations Formulas

Answer 6

How many spots do you have? Place the # of potential items in each spot (3 types of shells, 4 types of meat, 3 types of cheese, 5 types of salsa)

Does order matter?
If yes- just multiply
If no- multiply then divide by the number of spots in the group factorial
(divide by 4!)