2. निम्नलिखित बारम्बारता सारणी का पद विचलन' विधि से समान्तर माध्य ज्ञात कीजिए,
वर्ग अन्तराल
20-25,25-30,30-35,35-40,40-45,45-50
बारम्बारता 2,9,8,10,12
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