Wednesday
October 22, 2014

Homework Help: Math

Posted by Lindsay on Monday, September 25, 2006 at 5:25pm.

Question 1 : We would like to test 3 different treatments on a particu-
lar type of plant. A worker at the local greenhouse will allow us to use 3
among 10 plants. Note: Each treatment will be used on one and only one
plant.

a) In how many different ways can we assign the plants to the treatments?

b) Suppose that 2 of the ten plants are older than the other 8 plants. Assuming that we are choosing the plants randomly, what is the probability that at least one of the two older plants will be chosen among the three selected
plants?


There are 10C3 10 choose 3 ways to select a plant, and 3 solutions we could use on a plant. You should be able to calculate this.
The easier way to calculate b) is to observe that there are
8C3 ways to select only younger plants out of 10C3 total ways to select plants. Thus the prob of only younger plants is
(8C3)/(10C3) and the prob that at least on plant is an older one is
1 - (8C3)/(10C3)

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Math - We would like to test 3 different treatments on a particular type of ...
Science - Compare the nature greenhouse effect process with the human induced. 2...
Biology - You are testing a hypothesis that population density of a particular ...
statistics for behavioral sciences - In a one- to two-page Microsoft Word ...
statistics for behavioral sciences - In a one- to two-page Microsoft Word ...
statistics z or t test - the average weekly earnings of a production worker ...
statistics - n=15 and there are 3 groups These data are analyzed by an ANOVA, ...
math - a multiple choice test has 8 questions with 4 possible answers for each ...
Public Administration / GOVT - This may seem like an easy question, but I am ...
math - Your teacher is giving you a test worth 100 points containing 40 ...

Search
Members