Answer:
isn't this already fully simplified?
Step-by-step explanation:
Answer:
12 boys
Step-by-step explanation:
Use the ratio
7(3)= 21
4(3)= 12
Answer:
Step-by-step explanation:
This is not a question we need to at least know it’s equation.
Answer:
50%
Step-by-step explanation:
Recall : When given a normal or Symmetric distribution, the mean of the distribution is at the centre with 0.5 or 50% of the distribution to either side (right and left) of the distribution.
Hence, if the mean = 21 ; then the percentage of student body with atleast 21 years is the percentage to the left of the distribution, which is 50%.
Therefore, P(x ≤ 21) = 0.5 = 50%
Answer:
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Step-by-step explanation: