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hammer [34]
3 years ago
5

The scores of eighth-grade students in a math test are normally distributed with a mean of 57.5 and a standard deviation of 6.5.

From this data, we can conclude that 68% of the students received scores between and . NextReset
Mathematics
2 answers:
spayn [35]3 years ago
7 0

Answer:

44.5,70.5

Step-by-step explanation:

Empirical Rule-

  1. 68% of data falls within the one standard deviation from the mean.
  2. 95% fall within two standard deviations from the mean.
  3. 99.7% fall within three standard deviations from the mean.

Here, the normal distribution has the mean as 57.5 and standard deviation as 6.5

So the 68% of the score will lie between,

=\mu \pm 2\sigma

=57.5\pm 2(6.5)

=57.5\pm 13

=44.5,70.5

Firlakuza [10]3 years ago
5 0
Approximately 68% of a normal distribution lies within one standard deviation of the mean, so this corresponds to students with scores between (57.5-6.5,57.5+6.5)=(51,64).
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7 0
3 years ago
Read 2 more answers
Help please asap will mark brainliest !
Ber [7]

Answer:

b = 29

Step-by-step explanation:

C x D = A x B

15(11x - 91) = 7(2x + 10)

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add 1365 to both sides of the equation:

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subtract 14x from both sides:

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8 0
3 years ago
Please help! Please explain how to do this, I am so lost.
alexdok [17]
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8 0
3 years ago
A helicopter is hovering 110 feet in the air over a landing pad. If a man sees the helecopter at an angle of elevation of 29°, w
Pavel [41]
See the attached figure to better understand the problem

we know that

tan 29°=AC/CB--------> CB=AC/tan 29°
AC=110 ft 
CB--------> <span>how far the man is from the helicopter landing pad
</span>so
CB=AC/tan 29°----------> CB=110/ tan 29°----------> CB=198.45 ft

the answer is
the man is  198.45 ft  from the helicopter landing pad 

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3 years ago
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