The Z score is a measurement used in statistics to determine the relationship between a value and a mean of a group of values measured as standard deviation from the mean. The z score (z) is given as:

$z=\frac{x-\mu}{\sigma}$ , Where μ is the mean, σ is the standard deviation and x is the value.

Given that:

σ = 7, μ = 80 and x = 90

$z=\frac{x-\mu}{\sigma}=\frac{90-80}{7} =1.43$

From the normal distribution table, P(X < 90) = P(z < 1.43) = 0.923

7 0

3 years ago

Which number is 4 units from-1

ella [17]

4 + -1 = 3

Or -1 - 4 = -5

I would put 3.

8 0

2 years ago

An elevator goes up 7 floors and then down 4 floors. What integer represents the change in the floor level?

mariarad [96]

Going up 7 and then down 4 can be represented by 7-4=3

4 0

3 years ago

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