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Mumz [18]
3 years ago
7

Jane is seven years older than amy. twelve years ago, amy was half as old

Mathematics
2 answers:
Ilya [14]3 years ago
7 0
Jane+7=amy's age
7x2=14  14/2=7
j14=a7
amy -    7 +12years =19years now
goldenfox [79]3 years ago
7 0
J=jane's age now
a=amy's age now
a-12=amy's age 12 years ago


j is 7 older than a
j=7+a

12 years ago
amy was 1/2 as old as jamie is now
a-12=(1/2)j

so
j=7+a
sub 7+a for j

a-12=(1/2)(7+a)
times 2 both sides
2a-24=7+a
minus a both sides
a-24=7
add 24 both sides
a=31

j=7+a
j=7+31
j=38


jamie is 38 now
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The fact that 1200 births were randomly selected and only 599 of such picks are girls does not give enough information on whether the birth is significantly high, low or neither. We must have other information to test for significance of the births proportion.

All we know is that;

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If we examine the proportion closely, there seems to be no significant difference in the birth proportion.

Having said this, we cannot really imply that, the number of girls is significantly high. Or the number of girls is neither significantly low nor significantly high. Or the number of girls is significantly low.

The best subjective submission will be that, <em>there is no significant difference between girls birth and males birth.</em> The question of high or low (an alternative hypothesis) requires some further statistical test and this question does not provide further details.

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