5th HMQ 9,12,14-16

Given independent random variables with means and standard deviations as shown, find the 
Mean of:
X - 20

• 60
• -8
• -17
• 100

Given independent random variables with means and standard deviations as shown, find the 
Standard Deviation of:
X - 20

• 124
• -8
• 12
• 3

Given independent random variables with means and standard deviations as shown, find the 
Mean of:
3X - Y

• -44
• 68
• 256
• 228

Given independent random variables with means and standard deviations as shown, find the 
Standard Deviation of:
3X - Y

• 33
• 20.56
• 35.87
• 36.12

Given independent random variables with means and standard deviations as shown, find the 
mean of:
Y + Y

• 12
• 160
• 24
• 6

A delivery company's trucks occasionally get parking tickets and based on past experience, the company plans that the trucks will average 1.3 tickets a month, with a standard deviation of 0.7 tickets. 
If they have 18 trucks, what is the mean of the total number of parking tickets the company will have to pay this month?

• 1.3
• 23.4
• 0.7
• 12.6

A delivery company's trucks occasionally get parking tickets and based on past experience, the company plans that the trucks will average 1.3 tickets a month, with a standard deviation of 0.7 tickets. 
If they have 18 trucks, what is the standard deviation of the total number of parking tickets the company will have to pay this month?

• 1.3
• 2.969
• 0.7
• 12.6

A delivery company's trucks occasionally get parking tickets and based on past experience, the company plans that the trucks will average 1.3 tickets a month, with a standard deviation of 0.7 tickets. 
What assumption did you make to answer the previous questions?

• That the expected value was independent. 
• That the trucks were chosen randomly
• that the calculations were done accurately
• That each truck is independant

The American Veterinary Association claims that the annual cost of medical care for dogs averages $100 with a standard deviation of $30, and for cats averages $120 with a standard deviation of $35. 
What's the expected difference in the cost of medical care for dogs and cats?

• $70
• $20
• $85
• $5

The American Veterinary Association claims that the annual cost of medical care for dogs averages $100 with a standard deviation of $30, and for cats averages $120 with a standard deviation of $35. 
What's the standard deviation in the cost of medical care for dogs and cats?

• $5
• $18.03
• $65
• $46.10