A class has 20 students. If the teacher is randomly selecting a group of 3 students to represent the class on the student counci
2 answers:
Answer:
P(Sarah and her two best friends will all be chosen)=1/1140
Step-by-step explanation:
A class has 20 students.
The teacher is randomly selecting a group of 3 students to represent the class on the student council.
The number of ways of choosing 3 students out of 20=
= 1140
we have to find the probability that Sarah and her two best friends will all be chosen.
That means Sarah and her friends are one group to be chosen.
Hence, P(Sarah and her two best friends will all be chosen)=1/1140
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Answer:
(a) 0.2707
(b) 0.8576
Step-by-step explanation:
Answer:
1/3
Step-by-step explanation:
<em>Method 1.</em>
slope = rise/run
Rise is vertical distance.
Run is horizontal distance.
Find two points that are easy to read (on grid intersections):
(2, -1) and (5, 0).
Start at (2, 1). You need to go to (5, 0) by moving only vertically and horizontally. Go up 1 unit. That is a rise of 1. Now go right 3 units. That is a run of 3.
rise = 1
run = 3
slope = rise/run = 1/3
<em>Method 2.</em>
Use the slope formula and two points on the line.
Use points (2, -1) and (5, 0).
slope = 1/3