Johnson Electronics Corporation makes electric tubes. It is known that the standard deviation of the lives of these tubes is 140 hours. The company’s research department takes a sample of 110 such tubes and finds that the mean life of these tubes is 2100 hours. Required:
What is the probability that this sample mean is within 24 hours of the mean life of all tubes produced by this company?

answer is x<

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:

step-by-step explanation:

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