Answer:
Mean is 91
SD=6.8 to the nearest tenth.
Step-by-step explanation:
Leema's test scores in chemistry are 80, 95, 88, 92, and 100.
We want to find the mean and standard deviation.
The mean is given by:
[tex]\bar X=\frac{80+95+88+92+100`}{5}[/tex]
[tex]\bar X=\frac{455`}{5}=91[/tex]
The standard deviation is given by:
[tex]SD=\sqrt{\frac{\sum(x-\bar X)^2}{n} }[/tex]
[tex]SD=\sqrt{\frac{(80-91)^2+(95-91)^2+(88-91)^2+(92-91)^2+(100-91)^2}{5} }[/tex]
[tex]SD=\sqrt{\frac{1140}{25} }[/tex]
SD=6.8 to the nearest tenth.
