SIMPLE PROBABILITY
Favourable outcomes ÷ total outcomes
Answer as fraction, decimal, % • NO SCROLL
FAVOURABLE
3
How many outcomes you want
TOTAL
8
Total possible outcomes
ROUNDING
2DP
Decimal and % rounding
RULES
0..1
Clamps F to 0..T (if T>0)
Probability is between 0 and 1
QUICK FORMS
Fraction: F/T (simplified)
Decimal = F ÷ T
Percent = (F ÷ T) × 100
WORKING
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PROBABILITY
READY
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FAVOURABLE
3
How many you want
TOTAL
8
Total possible
ROUNDING
2DP
Decimal + %
RULES
0..1
Clamps F to 0..T (if T>0)
0 ≤ P ≤ 1
WORKING
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—
—
PROBABILITY
READY
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HOW TO USE
1) Enter FAVOURABLE
2) Enter TOTAL
3) Press SOLVE
4) Read fraction, decimal, %
FORMULA
P = favourable ÷ total
Simplify the fraction
Decimal = F ÷ T
WORKED EXAMPLE
P(blue) from 3 of 8
P = 3/8 = 0.375
= 37.5%
CHECKS
Total must be > 0
F is clamped to 0..T
Answer must be 0..1
If total=0 → ERROR
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