Im stuck with this exercise

Part of the quality testing of the Kensington French Fries Corporation is to ensure that all frozen products have product size uniformity. To celebrate the fall season, a new russet burbank fry has been released. A package is expected to contain between 240 grams and 260 grams. Assuming that the uniform distribution applies, answer the following questions: What is the mean amount per package? What is the standard deviation? C.) What is the probability of selecting a package is less than 255 grams? d. ) What is the probability of selecting a package is more than 255 grams? Question 4 The heights of students in the class can be summarized as follows: Classes Bin Frequency 155 159 159 155 169 169 8 157 179 179 18 157 189 189 10 158 More 1 160 160 160 160 Class Heights 163 20 165 168 168 170 170 170 Frequency 65656 170 170 172 174 O 175 159 169 179 189 More 175 Height 175 178 178 n 42 178 Mean 173.50 178 Variance 112.92 178 St.Dev 10.63 178 178 179 182 182 183 187 188 188 188 188 188 188 193