Answer:
Let's look at the 3 sandwiches and 3 soups first and then expand the calculation. There are 9 ways I can have one of the sandwiches and 1 of the soups:
⎛
⎜
⎜
⎜
⎜
⎝
0
Soup 1
Soup 2
Soup 3
Sandwich 1
1
2
3
Sandwich 2
4
5
6
Sandwich 3
7
8
9
⎞
⎟
⎟
⎟
⎟
⎠
And so we can see that we multiply the number of sandwiches and the number of soups to get the total number of ways to get one of each.
The same works for more categories of choices, and so we multiply the 3 sandwiches, the 3 soups, 4 salads, and 2 drinks to get:
3
×
3
×
4
×
2
=
72
Step-by-step explanation:
Answer: The correct option would be,
B. total += number
Step-by-step explanation:
Since, the variable used to keep the running total is called sum of the numbers or accumulator,
Thus, accumulator = total + number,
i.e. we obtain accumulator by assigning total to total plus number.
Or, accumulator is,
total += number,
Hence, OPTION 'B' is correct.
(a) The mean of the number of different species of plants in some gardens is 4.5 .
(b) The standard deviation of the number of different species of plants in some gardens is 2.12 (Approximately)
It is given in the question that the number of different species recorded are:-
1 2 3 4 4 5 5 6 7 8
We have to find the mean and standard deviation of the given data of the number of plants of different species.
(a) We know that, the formula for mean is :-
Sum of all the observations/ Total number of observations
Hence,
Mean = 
(b) Standard deviation = 
Where,
X = each value
m = mean
N = number of values
Hence,
Standard deviation = 
(approximately).
To learn more about mean, here:-
brainly.com/question/13451489
#SPJ4
First cross multiply to get:
80x = 65(x+3) (distribute)
80x=65x+195
15x=195 (subtract 65x from both sides)
x=13 (divide both sides by 15)
Hope this helps
