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frozen [14]
3 years ago
5

Is is true that the coefficient of the expression 18z-7(-3+2z) of z is 13

Mathematics
1 answer:
Sever21 [200]3 years ago
3 0
<span>18z-7(-3+2z) 
= 18z + 21 - 14z
= 4z + 21

answer is False
</span><span>coefficient of z is 4, not 13</span>
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The age of some lecturers are 42,54,50,54,50,42,46,46,48 and 48 calculate the mean age and standard deviation
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Standard deviation =

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=√36 + 36 + 4 + 36 + 4 + 36 + 4 + 4 + 0 + 0/ 10

=√160/10

= √16

= 4

The standard deviation of the ages is 4

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