Kuldeep Kumar Tiwari, Researcher, School of Mathematics, Shri Mata Vaishno Devi University (SMVDU) has been declared qualified for the award of Doctor of Philosophy (PhD) in Mathematics.The candidate has worked on the topic, titled “A Study on the Estimation of Population Mean in Sample Survey” under the supervision of Dr. Sandeep Bhougal, Assistant Professor, School of Mathematics, SMVDU. He has published research work in SCI and Scopus indexed journals and presented papers at various international and national conferences. The researcher has expressed gratitude to his supervisor for guidance and support and Shri Mata Vaishno Devi University for providing all necessary support and facilities for carrying out the research work.