: En unas oposiciones, el temario consta de 90 temas. Se eligen tres temas al azar de entre los 90. Si un opositor sabe 30 de los 90 temas, ¿cuál es la probabilidad de que sepa al menos uno de los tres temas?

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:

is there any other information given for this problem? this is not enough information.