<apex:page sidebar="false" controller="wrapper_delete">
<apex:form >

<apex:pageBlock >
<apex:pageBlockButtons >
<apex:commandButton value="Delete Selected" action="{!delete_selected}"/>
</apex:pageBlockButtons>
<apex:pageMessages ></apex:pageMessages>
<apex:pageBlockTable value="{!accounts}" var="a">
<apex:column headerValue="Action">
<apex:inputCheckbox value="{!a.checkbox}" />
</apex:column>
<apex:column headerValue="Name">
{!a.acc.name}
</apex:column>
<apex:column headerValue="Phone">
{!a.acc.Phone}
</apex:column>
</apex:pageBlockTable>

</apex:pageBlock>
</apex:form>
</apex:page>

class:

============

public with sharing class wrapper_delete
{
//deletion of selected records--------------------------------

public PageReference delete_selected()
{
list<account>selected=new list<account>();
for(wrapper wrp:wrap_list)
{
if(wrp.checkbox==true)
{
selected.add(wrp.acc);
}
}
delete selected;
ApexPages.Message myMsg = new ApexPages.Message(ApexPages.Severity.INFO, selected.size()+' Records deleted');
apexpages.addmessage(myMsg);
return null;
}

public list<wrapper>wrap_list { get; set; }
wrapper w;
public list<account>acc_list;

//populate accounts--------------------------
public list<wrapper>getaccounts()
{
acc_list=new list<account>();
wrap_list =new list<wrapper>();
acc_list=[select id,name,phone from account limit 50];
for(account a:acc_list)
{
w=new wrapper();
w.checkbox=false;
w.acc=a;
wrap_list.add(w);
}
return wrap_list;
}
//wrapper class---------------------------------------------------
public class wrapper
{
public boolean checkbox{get;set;}
public account acc{get;set;}
}

}