Can someone help me solve part 2 please?

Intro You bought Sumsung stock for $49 on April 1. The stock paid a dividend of $2 on July 1, and had a price of $57. It is now Oct. 1, and the stock price is $48. Treasury bills yield 1%. IB Attempt 1/10 for 10 pts. Part 1 What was the arithmetic average quarterly return? 0.023093448 Correct Quarterly returns: Pi + D1 11 = Po 57 + 2 1 = 1= 0.2041 49 48 r2 = - 1 = 57 - 0.1579 Arithmetic average return: T'i + 12 0.2041 + 0.1579 Ta = 2 2 0.02309 Part 2 - Attempt 4/10 for 10 pts. What was the standard deviation of quarterly returns? 3+ decimals Previous answers: 0.180988185; 0.127420642; 0.180988185 Submit