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28.03.2020 •
Mathematics
What is the slope of this line?
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Ответ:
the slope is 0
Step-by-step explanation:
that is y = 2
no rise only run
Ответ:
the reading speed of a sixth-grader whose reading speed is at the 90th percentile is 155.84 per minute
Step-by-step explanation:
Since the the reading speed of sixth-grade students is approximately normal, we would apply the formula for normal distribution which is expressed as
z = (x - µ)/σ
Where
x = reading speed
µ = mean speed
σ = standard deviation
From the information given,
µ = 125 words per minute
σ = 24 words per minute
Looking at the normal distribution table, the z value corresponding to the 90th percentile(0.9), is 1.285
Therefore,
1.285 = (x - 125)/24
24 × 1.285 = x - 125
30.84 = x - 125
x = 125 + 30.84
x = 155.84