A golfer claims that 78% of the time, he will score less than 90 on the golf course he normally plays. Consider his next 10 rounds of golf. Complete parts a through d. a. What is the probability that he will score lower than 90 on all 10 rounds? The probability is 0.0833 . (Type an integer or decimal rounded to four decimal places as needed.) b. What is the probability that he will score lower than 90 on 8 or more rounds? The probability is (Type an integer or decimal rounded to four decimal places as needed.)