The frequency tree will be 9 girls and 18 boys don't have a voucher.
Boys = 38
Girls = 22
Total = 60
Children who have a voucher = 33
Children who don't have a voucher = 60-33 = 27
Twice as many boys as girls do not have a voucher
Girls who don't have a voucher: x
Boys who don't have a voucher: 2x
Girls without voucher + boys without voucher: x + 2x = 27
3x = 27
x = 27/3
x = 9
Girls who don't have a voucher: x=9
Boys who don't have a voucher: 2x = 2(9) = 18
For frequency tree:
Total students: 60
Boys : 38
Boys who don't have a voucher : 18
Boys who have a voucher: 38 - 18 = 20
Girls: 22
Girls who don't have a voucher: 9
Girls who have a voucher: 22 - 9 = 13
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