Heather recorded the weight of her cat Sally for the past ten months. She is going to the vet this month. She is predicting that the cat's weight will be close to the mean of her data. About how much

Heather recorded the weight of her cat Sally for the past ten months. She is going to the vet this month. She is predicting that the cat's weight will be close to the mean of her data. About how much is she predicting that Sally will weigh?