Answer:
New mean = 8.
Step-by-step explanation:
Mean = 7.5 and N = 10
[tex]Mean(\bar{X}) = \frac{\sum x}{N}[/tex]
[tex]7.5 = \frac{\sum x}{10}[/tex]
[tex]\sum x = 7.5 \times 10 = 75[/tex]
Now if number 3 is removed then,
[tex] New \sum x = 75 - 3 = 72[/tex]
and n = 10 - 1 = 9 (since 1 number in a series is removed)
[tex]New\ mean = \frac{New \sum x}{n} = \frac{72}{9} = 8[/tex]
