How to calculate the standard error of the sample mean based on info in pic

The legislature of Israel is known as the Knesset. The Knesset is a unicameral legislative body with 120 seats where members are elected via proportional representation. In other words, the number of seats a party gets is proportional to the percent of the national vote they get in the election. In order to get any seats whatsoever, a political party must get 3.25% of the vote. You are a pollster working for the Yellow Party, a new party just formed in Israel. After campaigning for months, a series of polls have come out. In 16 polls, the average support for the Yellow Party has been 3.8%, with a standard deviation of 1.2%