One-half the sum of a number and four is three less than the quotient of five and the number..

it is c CDEF ≅ NMOP                                                                                                      

24 ± 0.224

Step-by-step explanation:

Confidence interval = mean ± critical value × standard error

CI = μ ± CV × SE

The critical value is the t score or z score.  Since n > 30, we can approximate using the z score.  For 95% confidence, z = 1.96.

The standard error is:

SE = σ / √n

SE = 0.8 / √49

SE = 0.114

So the confidence interval is:

CI = 24 ± (1.96) (0.114)

CI = 24 ± 0.224