need help with this :

The heights of students in the class can be summarized as follows: Classes Bir Frequency 155 159 159 169 169 8 155 157 179 179 18 157 189 189 10 158 More 1 160 160 160 Class Heights 160 163 20 165 18 168 16 168 170 170 170 Frequency 170 170 172 174 ONDO 169 179 189 More 175 159 175 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 Assuming that this approximates a standard normal distribution, use the Z table to estimate: a) The number of students over 180 cm (Calculate probability first). The number of students between 175 and 185 cm. The number of students less than 175 cm. The number of students between 160 and 180 cm. Count the actual number in the above ranges and compare the results