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anonymous

  • one year ago

The grades received by 200 students follow a normal distribution. The mean of the grades is 70%, and the standard deviation is 7%. The number of students who received a grade greater than 70% is about (blank) and the number of students who got a grade higher than 84% is about (blank)

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  1. anonymous
    • one year ago
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    I would love to answer this for you, but what do the "about (blank)s represent?

  2. anonymous
    • one year ago
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    \[P(X>70)=P\left(\frac{X-70}{7}>\frac{70-70}{7}\right)=P(Z>0)\] \[P(X>84)=P\left(\frac{X-70}{7}>\frac{84-70}{7}\right)=P(Z>2)\]

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