Answer:
mean = 40 + 50 + 70 + 80 + 100 + 100 + 120 + 150 + 250 + 250
= 1,120 ÷ 10
Variance = (-81)² + (-71)² + (-51)² + (-41)² + (-21)² + (-21)² + (-1)² + 29² + 129² + 129² / 10
= 6,561 + 5,041 + 2,601 + 1,681 + 441 + 441 + 1 + 841 + 16,641 + 16,641 / 10
= 50,890 / 10
standard deviation = √5,089
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Answer:
mean = 40 + 50 + 70 + 80 + 100 + 100 + 120 + 150 + 250 + 250
= 1,120 ÷ 10
= 121
Variance = (-81)² + (-71)² + (-51)² + (-41)² + (-21)² + (-21)² + (-1)² + 29² + 129² + 129² / 10
= 6,561 + 5,041 + 2,601 + 1,681 + 441 + 441 + 1 + 841 + 16,641 + 16,641 / 10
= 50,890 / 10
= 5,089
standard deviation = √5,089
= 71