student of the ninth grade with a total s, scored 75 in an exam in which the m E all students was 70 and standard dev cores was 2. Bob, a student of the tent ith a total of 50 students, scored 72 in

Given:

John

Raw score (x₁) = 75

$$\begin{gathered} Population mean\left({\mu }_1\right)=70 \\ Population s\tan dard deviation \left({\sigma }_1\right)=2 \\ Sample size \left(n_1\right)=50 \end{gathered}$$

Bob

Raw score (x₂) = 72

$$\begin{gathered} Population mean\left({\mu }_2\right)=65 \\ Population s\tan dard deviation \left({\sigma }_2\right)=3 \\ Sample size \left(n_2\right)=50 \end{gathered}$$