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Vinil7 [7]
3 years ago
5

Assume the number of customers who order a dessert with their meal on a given night at a local restaurant has the probability di

stribution given below. The variance for the random variable x is _____. a. .77
Mathematics
1 answer:
Bumek [7]3 years ago
5 0

Complete question :

X: 3, 4, 5, 6

f(x): .25, .55, .15, .05

Answer:

0.60

Step-by-step explanation:

Given the data:

Variance (s) :

Σx²*f(x) - E(x)²:

E(x) = (3*0.25) + (4*0.55)+(5*0.15)+(6*0.05) = 4

Σx²*f(x) - E(x)²: [(3^2 * 0.25)+(4^2 * 0.55)+(5^2 * 0.15)+(6^2 * 0.05)] - 4²

16.6 - 16 = 0.6

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