pre_text: As of December 31, 2019, exercisable options had an intrinsic value of less than $0.1 million. The intrinsic value of options exercised was $0.4 million in 2019 and $0.1 million in 2018. The following are the assumptions used in valuing the 2019 and 2018 stock option grants: In January 2020, we issued options to employees for the purchase of up to 591,004 shares of common stock, at an exercise price of $1.23 per share which vest and become exercisable in four annual installments ending in January 2024. The options have a grant date fair value per share of $1.26.
table: Year Ended December 31
table: 2019 2018
table: Assumed volatility 64% - 69% 75% - 81%
table: (67% weighted average) (78% weighted average)
table: Assumed risk free interest rate 1.8% - 2.7% 2.2% - 2.8%
table: (2.4% weighted average) (2.5% weighted average)
table: Average expected life of options (in years) 6.1 - 6.3 6.2
table: (6.2 weighted average) (6.2 weighted average)
table: Expected dividends - -
question: Analyse this data from a financial earnings document. What is the average assumed risk free rate in 2018?