Please can someone wander and tell me how to work this out??

Hey there! :)

7.6 years.

Step-by-step explanation:

Each age has a specific frequency. Find the sum by multiplying each age by the frequency then adding each together:

Age 6 has a frequency of 1. 6(1) = 6.

Age 7 has a frequency of 4. 7(4) = 28.

Age 8 has a frequency of 3. 8(3) = 24.

Age 9 has a frequency of 2. 9(2) = 18.

Add up all of these values to find the sum:

6 + 28 + 24 + 18 = 76.

Find the mean (the average of all ages): sum / # of ages given

76 / 10 = 7.6 years.

maybe - definition of supplementary angles. im not sure. sorry

step-by-step explanation:

e^-kt = n/n0 = 0.79  

-kt = ln 0.79  

t = - ln 0.79/0.0001  

= 2357 years

step-by-step explanation: