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Blue pens: 30%

Black pens: 44.8%

Pencils: 25.2%

400 people: 280 people

Step-by-step explanation:

Begin by adding up everyone:

75+112+63= 250

Percentage of blue pens:

75/250= 30.0%

Percentage of black pens:

112/250= 44.8%

Percentage of pencils:

63/250= 25.2%

400 people:

280 people

c

step-by-step explanation:

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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step-by-step explanation: