Due to high operational cost, Herrizon Commercial Bank (HCB) wishes to close
those savings accounts that do not maintain a certain minimum monthly
balance. Currently the mean monthly balance of the savings accounts is Sh.
25,000 with a standard deviation of Sh. 5,000. The bank wishes to close 10%
of the accounts with the lowest monthly balance. Further, the balances are
assumed to be normally distributed.
The monthly balance that HCB should require its savings accounts customers
to maintain in order for the accounts not to be closed. (10