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Brilliant_brown [7]
3 years ago
7

two trains depart Charlotte at the same time. one train heads North at 60 mph. there other train heads South at 40 mph. after 4

1/2 hours, how far apart are the trains?​

Mathematics
1 answer:
belka [17]3 years ago
5 0

Answer:

Step-by-step explanation:

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Answer:

Mean age: 48

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Step-by-step explanation:

a) Mean

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Number of terms

= 42 + 54 + 50 + 54 + 50 + 42 + 46 + 46 + 48+ 48/ 10

= 480/10

= 48

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b) Standard deviation

The formula for Standard deviation =

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Standard deviation =

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= √-6² + 6² + 2² + 6² + 2² + -6² + -2² + -2² + 0² + 0²/10

=√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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