Answer:
3.5
Step-by-step explanation:
we can divide that
as you see the first one is really easy
the second one is < because it points to the lower number
the third one we have
twice a number is 7
let's say x is the number
so twice x is 7
twice means 2 times
so 2 times x is 7
so the number is 3.5
Step-by-step explanation:
4,5 x 102?
97.5% of American women have shoe sizes that are no more than 11.47.
Lets try to solve the question,
Given values ,
Dev (u) = 8.47
Standard deviation (x) = 1.47
So we e have to find the percentage of American women whose shoe size's are not more than 11.47 P(x<11.47).
Lets find z score by using empirical formula.
=>
=>
=>
Now we have to find . Using the empirical rule, we know that 97.5% data lies below 2 standard deviations above mean.
Therefore the 97.5% of American women have shoe sizes that are no more than 11.47.
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