How many ntp servers should ntpd be configured to poll?

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Issue

When configuring the ntpd service via /etc/ntp.conf (or using system-config-date) how many servers should be added? Is there a maximum? What if one or two of the servers that are being synched with has the wrong time -- are the times averaged?

Environment

Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
ntpd from ntp package

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