3 years ago

Find the class boundaries.

Mathematics

1 answer:

miv72 [106K]3 years ago

7 0

Answer:

Step-by-step explanation:

To find the class boundary of this

We have to get the lower boundary and upper boundary

54.5-59.5

59.5-64.5

64.5-69.5

69.5-74.5

74.5-79.5

79.5-84.5

84.5-89.5

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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

I need a thorough explanation, if not, only an answer with some steps would be fine.

Darya [45]

Answer:

$92.25

Step-by-step explanation:

If Diego spent $20.50 and Sandy spent 4.5x as much as Diego, that means that Sandy spent 20.5x4.5, which equals 92.25. Sandy spent $92.25

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3 years ago

What is the product? Assume x > 0 (sqrt 3x + sqrt 5) (sqrt 15x + 2 sqrt 30)

CaHeK987 [17]

Answer:

B hope it helps

Step-by-step explanation:

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3 years ago

Plz answer the question below

solmaris [256]

X equal to 6 plus 1 by 3 which is 19 by 3 is the answer which is also a improper fraction

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3 years ago

Read 2 more answers

Stanley recieved 110 pieces of candy for Halloween. He gave 20% of his candy to his little brother. So far, he has eaten 25% of

SVEN [57.7K]

10% of 110 = 11
20%= 11 x 2 = 22
22
10% of 22 = 2.2
2.2 x 2 = 20% = 4.4
2.2/2= 5% =1.1
4.4+ 1.1
=5.5 pieces of candy left

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3 years ago