Answer:
840
Step-by-step explanation:
Given


Required
Determine the number of rankings
The term "ranking" as used in this question implies permutation and the required is calculated using:

Where


So:






<em>Hence, number of ranking is 840</em>
The mean is the average.
Add all the number of pets and divide by how many people there were.
3+5+2+4+1
15/number of people
15/5
=3
Hope this helps :)
30 is your mystery answer :)
Answer:
4
Step-by-step explanation:
4X7 =28
4X2 =8
28-8 =20/5
=4
Hopes this helps:
Answer: 48