  In this paper we have proposed an almost unbiased estimator using known value
of some population parameter(s) with known population proportion of an
auxiliary variable. A class of estimators is defined which includes [1], [2]
and [3] estimators. Under simple random sampling without replacement (SRSWOR)
scheme the expressions for bias and mean square error (MSE) are derived.
Numerical illustrations are given in support of the present study. Key words:
Auxiliary information, proportion, bias, mean square error, unbiased estimator.
