1. Given an instruction sequence with instructions in classes A, B, and C as the table below:

Instruction Class	A	B	C
CPI	2	1	3
Instruction Count	10	40	10

Total number of instructions in this sequence =

Number of clock cycles from instruction class A =

Number of clock cycles from instruction class B =

Number of clock cycles from instruction class C =

Total number of clock cycles =

Average CPI for this instruction sequence = (Answer with a floating point value with 1 digit to the right of the decimal point, e.g. 4.5)

2. Given an instruction sequence with instructions in classes A, B, and C as the table below (same as the last two questions):

Instruction Class	A	B	C
CPI	2	1	3
Instruction Count	10	40	10

Suppose we are considering improving the execution with the following restrictions:

• We can only select one class of instructions to improve; and
• We will be able to reduce the execution time for the selected instruction class by 50%;
• No changes to other instructions.

Which instruction class should we select to achieve the most improvement?

		class A
		class B
		class C
		Either one: the improvement will always be the same.