I think what you do is in the number of children you write 0, 1, 2,3,4 the count how much times that number appears in the list and that’s your frequency, for eg
Number of children = 1
Frequency = 2
I am not 100% sure tho
2.47•10 to the eight power
$4.86/3=1.62 ------> unit price
1.62*2=$3.24 ----->multiply the unit price by 2 to find the cost of 2 kg