Answer:3.4d
Step-by-step explanation: From Range Rule of thump:
Standard Deviation = (Range)/4
=[(Highest value - lower value)]/4
=(189.2 - 175.6)/4
=13.6/4
=3.4
Answer:

Step-by-step explanation:

Expand brackets using the <em>FOIL</em> method.


Combine like terms.

Answer:
You would need 2.5
Step-by-step explanation:
You can use a porportion to solve.
(cross multiply and solve)
Answer:
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