A 52-year-old Washington man and an unidentified young woman were killed and a 71-year-old cab driver critically wounded during a robbery in three of five separate shooting incidents in the city in the last two days.

The dead man, identified as Jerardo P. Zayas, was shot twice in the side about 4 p.m. yesterday by two men who approached him in the 500 block of Q Street in what police suspect was a robbery attempt. Zayas was dead on arrival at the Washington Hospital Center.

The woman, who was described as being in her late teens or early 20s, was found about 11:20 last night on the sidewalk in the 2600 block of Naylor Road SE. She had been shot once in the head and was pronounced dead on the scene. Police said she was found by a security guard working nearby who heard a gunshot.

According to police, the hacker, Ernest L. Hubball, picked up two women passengers about 8 p.m. Sunday at the Madison Hotel at 15th and M streets NW. They asked him to take them to the 4700 block of Eads Street NE, where they robbed him and shot him in the abdomen. He was listed in critical condition last night at D.C. General Hospital.

The shooting of Hubball came less than three days after another man was fatally stabbed in an altercation with two other women at 15th Street and Rhode Island Avenue NW, about two blocks from where Hubball picked up his assailants.

In another shooting incident, the employer of a man killed recently in an apartment where police found a $22 million heroin cache, was himself robbed and shot yesterday. Police said there was no connection between the June 24 shooting of the employe and yesterday's shooting of the owner, who was carrying receipts to a bank.

Robert Cooper, 50, the owner of the Gulf service station at 1827 Adams Mill Rd. NW, was approaching the rear door of the Riggs National Bank branch on Columbia Road NW with $10,000 in cash and checks shortly after 9 a.m. when two men accosted him. There was a struggle and the robbers fired two shots. One of them struck Cooper, a Woodbridge, Va., resident, in the abdomen. He was listed in serious but stable condition last night at Washington Hospital Center.

Rasheed K. Zaman, 34, who worked as a manager at Cooper's station, was found shot to death last month in his apartment at 1929 Calvert St. NW. Three Washington residents were arrested and charged with homicide in the death.

In a fifth shooting, a man identified as Robert Jones, 24, of Hyattsville, was wounded in the legs and abdomen. Police said he told them he was standing at Illinois Avenue and Webster Street NW when a car pulled up and one of its occupants opened the door and fired five shots at him.