Module 10 day 2

Module 10 day 2

normal distribution - permutations and combinations

Poll

How are you feeling this morning?

• Good

• okay

• Tired

• Sick

• Sad

Multiple Choice

According to the empirical rule, how much of the data falls within 3 standard deviations? 

• 25%
• 68%
• 95%
• 99.7%

Multiple Choice

A group of data with normal distribution has a mean of 45. If one element of the data is 60, will the z-score be positive or negative?

• Positive

• Negative

• Neither

Multiple Choice

The mean GPA of students in a course at UCDavis is 3.2 with a standard deviation of 0.3. What percent of students in the course have a GPA between  2.9 and 3.8? 

• 81.5%
• 47.5%
• 68%
• 95%

Multiple Choice

The mean number of accidents a week at a company is 6.4 with a standard deviation of 1.5.  What proportion of weeks would you expect to have less than 5 accidents?

• 0.6915
• 0.1762
• 0.8238
• -0.93

Multiple Choice

₂₀P₂

• 20
• 380
• 6840
• 116280

Multiple Choice

Picking a President, Vice-President, and Secretary from a group of 12. Is an example of a permutation?

• yes

• no

Multiple Choice

How many ways can you listen to 3 songs from a CD that has 12 selections?

• 1320
• 33
• 36

Multiple Choice

₁₂C₃

• 0
• 1
• 220
• 1140

Multiple Choice

How many ways can two jellybeans be chosen from a bag of 15 unique jellybeans. 

• ₁₅C₂=105
• ₁₅P₂=210
• 15 x 2 = 30
• 100 ways

Multiple Choice

Four students need to be selected from a class

of 15 to help clean up the campus. How many different ways can the 4 students be chosen?

• 32 760

• 60

• 1 365

Multiple Choice

A Mathmatics test contains five different questions labeled A, B, C, D, and E. You are supposed to choose 2 to answer. How many different ways are there to do this?

• 5

• 10

• 15

Poll

Do you find online learning difficult?

• Yes.

• No.

• Sort of

• Sometimes