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Roman55 [17]
2 years ago
11

Need help on all three questions please?

Mathematics
1 answer:
Delicious77 [7]2 years ago
8 0

Answer:

Df=11

<b's complement must be 10°

<d's supplement must be 100°

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) Final averages are typically normally distributed with a mean of 72 and a standard deviation of 12.5. Your professor states th
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Answer:

65.45

Step-by-step explanation:

Zscore = (x - mean) / standard deviation

x = score

Percentage below C :

D = 18% ; F = 12%

Sum = 30%

Obtain the Zscore for the proportion below D

P(Z < 0.30) = -0.524

Hence, Zscore = -0.524

Put Zscore = -0.524 in the equation :

-0.524 = (x - 72) / 12.5

-0.524 * 12.5 = x - 72

-6.55 = x - 72

-6.55 + 72 = x

x = 65.45

To receive a grade of C or better, score must be atleast 65.45

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