20 points need fast steve buys 2 lb of grapefruit and 3 lb of oranges for $7.20. kennedy buys 4 lb of grapefruit and 2 lb of oranges for $8.80. let x represent the price per pound for grapefruit, and let y represent the price per pound for oranges. what is the price per pound for oranges?

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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: