2 years ago

Can someone plzzzz help with the last 3 question I really need it !!!

Mathematics

2 answers:

elixir [45]2 years ago

7 0

Answer:

It is 70 % for the first to last three

Step-by-step explanation:

lubasha [3.4K]2 years ago

4 0

Coupon is 345, tax is 138, 2300-345+138. Add that and you’ll get your final answer.

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3 years ago

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2 years ago

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3 years ago

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Alla [95]

Answer:

Step-by-step explanation:

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3 years ago

The scores for a certain test of intelligence are normally distributed with mean 85 and standard deviation 11. Find the 90th per

jonny [76]

Answer:

99.1 is the 90th percentile of these scores.

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 85

Standard Deviation, σ = 11

We are given that the distribution of score is a bell shaped distribution that is a normal distribution.

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

We have to find the value of x such that the probability is 0.90

$P( X < x) = P( z < \displaystyle\frac{x - 85}{11})=0.90$

Calculation the value from standard normal z table, we have,

$P(z \leq 1.282) = 0.90$

Putting values, we get,

$\displaystyle\frac{x - 85}{11} = 1.282\\\\x = 99.1$

Thus, 99.1 is the 90th percentile of these scores.

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3 years ago