the grades of a science test are normally distributed. thanh finds that his grade on the test has a z…

the grades of a science test are normally distributed. thanh finds that his grade on the test has a z - score of - 2.5. which statement must be true?\nthanhs grade is 2.5 standard deviations below the mean of the test grades.\nthanhs grade is 2.5 points below the mean of the test grades.\nthanhs grade is 2.5 standard deviations above the mean of the test grades.\nthanhs grade is 2.5 points above the mean of the test grades.

the grades of a science test are normally distributed. thanh finds that his grade on the test has a z - score of - 2.5. which statement must be true?\nthanhs grade is 2.5 standard deviations below the mean of the test grades.\nthanhs grade is 2.5 points below the mean of the test grades.\nthanhs grade is 2.5 standard deviations above the mean of the test grades.\nthanhs grade is 2.5 points above the mean of the test grades.

Answer

Explanation:

Step1: Comprender la interpretación del z - score

El z - score representa el número de desviaciones estándar que un valor está alejado de la media. Un z - score negativo significa que el valor está por debajo de la media, y un z - score positivo significa que el valor está por encima de la media.

Step2: Analizar el z - score dado

Se da un z - score de - 2.5. Esto significa que el puntaje de Thanh está 2.5 desviaciones estándar por debajo de la media.

Answer:

Thanh's grade is 2.5 standard deviations below the mean of the test grades.