This Post Has 4 Comments

1. hello,

   b) 62.47% of the students are between 14 and 18 years old.

   step-by-step explanation:

   mean = 15 and standard deviation = 2

   student between 14 to 18

   formula used z-score

   for age 14 , z score

   using z-table , p(z> -0.5)=0.3085

   for age 18 , z score

   using z-table , p(z< 1.5)=0.9332

   p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

   thus, 62.47% of the students are between 14 and 18 years old.

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2. i dont know i just need points

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3. 8y^50

   step-by-step explanation:

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4. the expected value of the random variable : 0, 1 and 2

   step-by-step explanation:

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