Answer: 3424.28
Step-by-step explanation:
Given data : 378, 361, 350, 375, 200, 391, 375, 368, 321
Number of data values = 9
Mean :

Variance = 

Variance = 
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Step-by-step explanation:
< PQS is exterior angle of the triangle
So,
2X = X + 58
X=58
m < P = 58
m <P QR = 180 - ( 58 + 58 ) =, 64
m < P QS = 116