Answer:
The expected frequency for the cell E2,2 is = 33
Step-by-step explanation:
The given data is
Gender               | 0-30| 30-60| 60-90| 90+       Totals
Male                    | 23    |    35   |   76    |  46        180 
<u> Female               |   31   |    42   |   46    |  16         135    </u>
<u>Totals                    54         77        122    62          315  </u>
<u />
The expected frequency for the cell E2,2 is :
Expected for the (30-60 box for females)   =  Total of (30-6)/ (total )* females
                                                                       = ( 77/315)135= 33
Here p= 77/315 and n= 135
therefor X= pn = 33
χ²=  (33-42)²/33= 2.455  ( for the single value of E2,2=33)
Expected for the (30-60 box for males)   =  Total of (30-6)/ (total )* males
                                                                       = ( 77/315)180= 44
χ²=  (44-42)²/44= 0.09
The critical region is  χ² (0.05) 3 ≥  χ²= 11.34
Let the null and alternate hypothesis be 
H0:the number of minutes spent online per day is not related to gender
against 
Ha: the number of minutes spent online per day is related to gender
The single value of χ² for E2,2 = 2.45 is less than the critical value of 11.34.