Answer:
Mean age: 48
Standard deviation: 4
Step-by-step explanation:
a) Mean
The formula for Mean = Sum of terms/ Number of terms
Number of terms
= 42 + 54 + 50 + 54 + 50 + 42 + 46 + 46 + 48+ 48/ 10
= 480/10
= 48
The mean age is 48
b) Standard deviation
The formula for Standard deviation =
√(x - Mean)²/n
Where n = number of terms
Standard deviation =
√[(42 - 48)² + (54 - 48)² + (50 - 48)² +(54 - 48)² + (50 - 48)² +(42 - 48)² + (46 - 48)² + (46 - 48)² + (48 - 48)² + (48 - 48)² / 10]
= √-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
Answer:
2a(7b+5)
Step-by-step explanation:
yeah-ya....... right?
Answer:
42 and 30
Step-by-step explanation:
Answer: 10 minutes
Step-by-step explanation:
Given : Three postal workers can sort a stack of mail in 20 minutes, 30 minutes, and 60 minutes, respectively.
Let T be the time taken by all of them when they working together.
Then , we have the following equation :-
Hence, the time taken by all of them when they working together = 10 minutes.
Answer:
Pang, Ruben, Adela, Tony
Step-by-step explanation:
So the Answer would be c. I hope this helped and have a good day.
