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3 years ago

13

I) -7s (S-4t-3u) ii) -4c (2c-5d)

2 answers:

kari74 [83]3 years ago

8 0

Answer:

I) -7 $s^2$ + 28 $st$ +21 $su$

II) -8 $c^2$ + 20 $cd$

Step-by-step explanation:

umka21 [38]3 years ago

3 0

I) -7s^2+28st+21su
II) -8c^2+20cd

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2 years ago

The class average on a math test was an 82 with a standard deviation of 5. If the

Alex787 [66]

Answer:

Option 3 and 4.

Step-by-step explanation:

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

$z=\frac{x-\mu}{\sigma} \\\\where\ x=raw\ score,\mu=mean, \ \sigma=standard\ deviation$

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1) For x = 74:

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Option 1 is incorrect

2) For x < 87

$z=\frac{x-\mu}{\sigma} \\\\z=\frac{87-82}{5} =1$

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Option 2 is incorrect

3) For x = 95:

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Option 3 is correct

4) For x < 77

$z=\frac{x-\mu}{\sigma} \\\\z=\frac{77-82}{5} =-1$

From the normal distribution table, P(x < 77) = P(z < -1) = 0.16 = 16%

Option 4 is correct

5) For x > 92

$z=\frac{x-\mu}{\sigma} \\\\z=\frac{92-82}{5} =2$

From the normal distribution table, P(x > 92) = P(z > 2) = 1 - P(z < -2) = 1 - 0.9772 = 0.0228 = 2.28%

Option 5 is incorrect

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2 years ago