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3 years ago

11

Supermarket managers who use scanners on the checkout counters to track inventory levels of their products are using a(n) ______

_________ system.

Computers and Technology

1 answer:

lidiya [134]3 years ago

6 0

Operation Information System, because you are only collecting data on the amount of products leaving the store.

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Assume X and Y are indepndent. Assume that X has mean 10 and standard deviation 8. Assume Y has mean 12 and standard deviation 6

Vitek1552 [10]

Answer:

$\sigma_z = 10$

Explanation:

Given

$\bar x = 10$

$\sigma_x = 8$

$\bar y = 12$

$\sigma_y = 6$

$z = x + y$

Required

$\sigma_z$

This is calculated as:

$\sigma_z = \sqrt{Var(x) + Var(y)}$

Calculate $Var(x)$

We have:

$Var(x) = \sigma_x^2$

$Var(x) = 8^2$

$Var(x) = 64$

Calculate $Var(y)$

We have:

$Var(y) = \sigma_y^2$

$Var(y) = 6^2$

$Var(y) = 36$

So, we have:

$\sigma_z = \sqrt{Var(x) + Var(y)}$

$\sigma_z = \sqrt{64 + 36}$

$\sigma_z = \sqrt{100}$

$\sigma_z = 10$

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