परियोजना प्रबंधन में एक PERT गतिविधि का अपेक्षित समय (te) किस सूत्र का उपयोग करके निकाला जाता है? [जहाँ to = आशावादी समय, tm = सर्वाधिक संभावित समय, tp = निराशावादी समय]

In Program Evaluation and Review Technique (PERT), an activity's expected time is 10 days. If the optimistic time is 7 days and the pessimistic time is 15 days, what is the most likely time?

Total Productive Maintenance (TPM) is being implemented in a bank's Data Centre to maximize the availability of its core banking systems. The TPM philosophy uses Overall Equipment Effectiveness (OEE) as a key performance indicator. If a server rack, which operates for 20 hours a day (Planned Production Time), experienced 1 hour of breakdown (Downtime) and ran at 90% of its optimal speed (Performance Rate), but only 80% of the transactions processed were error-free (Quality Rate), what is the effective Availability Rate component of the OEE calculation?