Claim severity without deductible (full coverage) has a uniform distribution on [0,b]. When a per-claim deductible equal to rb is in effect, the claim size variance is 0.75(1-r)² times the claim size variance when there is no deductible. Determine which interval contains the value of r.

• [0.55,0.6]
• [0.68,0.73]
• [0.75,0.79]
• [0.82,0.85]
• [0.9,0.95]