can you please solve.... where they say "specific surface " they were supposed to say specific surface area

QUESTION 1 [20 Marks] Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3). It is a very common and widespread mineral with highly variable forms and colours (Figure 1). Calcite is best recognized by its relatively low Mohs hardness (3) and its high reactivity with even weak acids, such as vinegar, plus its prominent rhombohedral cleavage in most varieties. An X-ray crystallography analysis showed the presence of mixture of particle sizes as shown in Table 1. From the tabulated data, determine the specific surface (g/m) of the mineral. Figure 1. Symmetrical three-dimensional solid shape. Density equation (kg/m): p = 06.0.6 where: y= 765 and x = 1200 Table 1. Particle size distribution. Mass retained (g) Mass ISS Mesh retained (g) 0 ISS Mesh -100 +85 -85 +80 -80 +70 -70 +60 -60 +50 -50 +40 -40 +35 -35 +30 -30 +25 -25 +20 33.5 324 315.5 120 182 78 79 -20 +18 -18 +15 -15 +12 -12 +10 -10 +9 -9 +8 -8 +6 -6 +5 -5 +4 26 27 28 40 26 27 28 29 69 39 29 1