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Here's a query that will give you the hit ratio. The miss rate is just 100 minus the hit rate.
select 1-(PHY.VALUE - LOB.VALUE - DIR.VALUE)/SES.VALUE "CACHE HIT RATIO" FROM V$SYSSTAT SES, V$SYSSTAT LOB, V$SYSSTAT DIR, V$SYSSTAT PHY WHERE SES.NAME ='session logical reads' and DIR.NAME ='physical reads direct' and LOB.NAME ='physical reads direct (lob)' and PHY.NAME ='physical reads';
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