What does it mean that an individual makes a 70 on a test and this score corresponds to the 50th percentile? The individual scored better than 70% of the people who took the test. With a score of 50, he performed better than 50% of the people who took the test. With a score of 70, he scored better than 50% of the people who took the test. 70 people scored higher than he did and 70 people scored lower than he did.

With a score of 70, he scored better than 50% of the people who took the test.

Step-by-step explanation:

What a percentile means?

When a value V is said to be in the xth percentile of a set, x% of the values in the set are lower than V and (100-x)% of the values in the set are higher than V.

What does it mean that an individual makes a 70 on a test and this score corresponds to the 50th percentile?

It means that 50% of the students scored 70 or higher, and 50% of the students scored 70 or lower.

So the correct answer is:

With a score of 70, he scored better than 50% of the people who took the test.

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: