7/28/2020 Practice Final Exam
4. Approximate the mean of the frequency distribution for the The approximate mean age is
ages of the residents of a town.
(Round to one decimal place as needed.)
years.
Frequency
31
39
13
27
Age
0-9
10-19
20-29
30-39
40-49
50-59
60-69
70-79
80-89
24
51
30
11
9
5.
Why is the standard deviation used more frequently than the variance?

Tomas is making trail mix using granola and walnuts. he can spend a total of $12 on the ingredients. he buys 3 pounds of granola that costs $2.00 per pound. the walnuts cost $6 per pound. he uses the equation to represent the total cost, where x represents the number of pounds of granola and y represents the number of pounds of walnuts. he solves the equation for y, the number of pounds of walnuts he can buy. answer- b tomas added 6 to both sides of the equation instead of subtracting 6. just took the test

What is the distance between point a and b

Which expression is equivalent to (4 +6i)^2? ? -20 + 48i 8 + 12i 16 - 36i 20 + 48i