The average (arithmetic mean) of a normal distribution of a school's test scores is 62, and standard deviation of the distribution is 6.5. A student scoring a 78 on the exam is in what percentile of the school?
Choices
Select
A) 63rd percentile	B) 68th percentile	C) 84th percentile	D) 96th percentile	E) 98th percentile
(78-65)/6.5= 
<gadget id="calculator">(78-65)/6.5</gadget>
<output>2</output>
2 sigmas or 95.5th percentile for +-2 sigma but in our case we need only upper tail, so it's 100 - (100 - 95.5)/2= 84th percentile   84th percentile
<result>C</result>
The average (arithmetic mean) of a normal distribution of a school's test scores is 62, and standard deviation of the distribution is 6.5. A student scoring a 78 on the exam is in what percentile of the school?
Choices