Before beginning voice lessons, Martina already knew how to sing 18 pieces, and she expects to learn 2 new pieces during each week of lessons. How many weeks of lessons will
Martina need before she will be able to sing a total of 24 pieces?

Before beginning voice lessons, Martina already knew how to sing 18 pieces, and she

expects to learn 2 new pieces during each week of lessons. How many weeks of lessons will

Martina need before she will be able to sing a total of 24 pieces?

step-by-step explanation:

10.50 + taxes which added up to 11.50

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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