Respuesta :
Answer:
Sara expect the better grade for Math class.
Step-by-step explanation:
Consider the provided information.
On the Math exam, the mean was µ = 30 with s = 5, and Sarah had a score of X = 45.
Z score for Math: [tex]Z=\frac{x-\mu}{s}[/tex]
[tex]Z=\frac{45-30}{5}[/tex]
[tex]Z=\frac{15}{5}[/tex]
[tex]Z=3[/tex]
On the Spanish exam, the mean was µ = 60 with s = 8 and Sarah had a score of X = 68.
Z score for Spanish: [tex]Z=\frac{x-\mu}{s}[/tex]
[tex]Z=\frac{68-60}{8}[/tex]
[tex]Z=\frac{8}{8}[/tex]
[tex]Z=1[/tex]
On the English exam, the mean was µ = 70 with s = 8 and Sarah had a score of X = 70.
Z score for English: [tex]Z=\frac{x-\mu}{s}[/tex]
[tex]Z=\frac{70-70}{8}[/tex]
[tex]Z=0[/tex]
We can observe that Z score of Math is greater than Spanish and English.
Which means that Sarah did the best in her Math exam.
Hence, Sara expect the better grade for Math class.
