Answer:
option C.
Step-by-step explanation:
The given graph is the bell shaped graph.
From the graph we can observe that the peak is at 69.
So, the mean of the data is = 69 .
Standard deviation is the deviation of the graph from the mean value.
= 72-69 = 3
Hence, the standard deviation is equal to 3.
So, the correct answer is option C.
0.81 is 81/100 as a fraction.
Answer:
Step-by-step explanation:
A part of a line that starts at one endpoint and extends forever in one direction is a ray.