Tour answer 1 point
Are all musical instruments tuned equally? For concerts they are. This is
known as "concert pitch," and it's based on setting the frequency of the A
key above middle C to 440 Hz. The frequency of any other note on the
piano, in Hz, is then related to its position on the keyboard by the function
below, where n is the number of keys above or below the "concert A.”
Using this function, can you find the position n of the key that has a
frequency of 55 Hz?*
f(n) = 440.27
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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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