1. ## statistics

HELLO

COULD ANYONE HELP ME DO THESE MATHS QUESTIONS?

3) sarah carries out A survey on two groups of people.
on the first group she calculate the mean age to be 10 and the range to be 3
with the second group she calculates the mean age to be 10 with a range of 7
explain the difference between the ages of the two groups of people

4) chris has to decide which type of battery his company is to use in their toys
hes has a choice between two differnet batteries
type a have a median life of 15 hours with range of 2 hours
type b have a median life of 15 hours but have a range of 6 hours
which type of battery does chris choose and why?

thank you

2. Originally Posted by kez
HELLO

COULD ANYONE HELP ME DO THESE MATHS QUESTIONS?

3) sarah carries out A survey on two groups of people.
on the first group she calculate the mean age to be 10 and the range to be 3
with the second group she calculates the mean age to be 10 with a range of 7
explain the difference between the ages of the two groups of people

4) chris has to decide which type of battery his company is to use in their toys
hes has a choice between two differnet batteries
type a have a median life of 15 hours with range of 2 hours
type b have a median life of 15 hours but have a range of 6 hours
which type of battery does chris choose and why?

thank you
The mean is similar to average. To find the mean, you need to add up all the data, and then divide this total by the number of values in the data.

The range gives the spread of data. To find the range, you first need to find the lowest and highest values in the data. The range is found by subtracting the lowest value from the highest value.

3) Group A has the age similar to 10 as the range is 3 so the age could be in the range 7-10 --> 10-13. Group A has a large range with a mean age of 10, this implies that the range of ages could be in 3-10 --> 10-17.

4) Chris should choose type A battery as the range is lower. This means that the values are close to 15 hours and would not have large outliers (Range of hours could be 12-18). Type B has a mean of 15 hours but the range is 6 so it may mean that the lowest hour could be 9 hours but the highest value could be 24 hours.