The dot plot shows predictions for the winning time in the

Mathematics

1 answer:

Bas_tet [7]2 years ago

7 0

Answer:

3.33

Step-by-step explanation:

i took the quiz sub to airrack

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The distribution of scores on a recent test closely followed a Normal Distribution with a mean of 22 points and a standard devia

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6.68% of the students scored at least 19 points on this test while the 85 percentile has a test score of 24.08 points

The z score is used to determine by how many standard deviations the raw score is above or below the mean. The z score is given by:

$z=\frac{x-\mu}{\sigma} \\\\where\ \mu=mean.\sigma=standard\ deviation, x=raw\ score\\\\Given\ that\ mean(\mu)=22,standard \ deviation (\sigma)=2\\\\For\ x>19:\\\\z=\frac{22-19}{2}=1.5$

P(x > 19) = P(z > 1.5) = 1 - P(z < 1.5) = 1 - 0.9332 = 0.0668

6.68% of the students scored at least 19 points on this test

b) 85 percentile corresponds to a z score of 1.04

$z=\frac{x-\mu}{\sigma}\\\\1.04 =\frac{x-22}{2} \\\\2.08=x-22\\\\x=24.08$

The 85 percentile has a test score of 24.08

Find out more at: brainly.com/question/25012216

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3 years ago

More math help please im lazy ._.

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there are no real square roots of 25,36

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In June Gemma paid £68 for her electricity.

Volgvan

Answer:
Total amount paid in july: $68 + $3.40 + 71.40
Step-by-step explanation:
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Step-by-step explanation:

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2 years ago

9000 dollars is placed in an account with an annual interest rate of 7.75%. How much will be in the account after 18 years, to t

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